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iMac display turning off randomly with external monitors

I have a Mid 2011 27-inch iMac running OS X 10.8.4 with the AMD Radeon HD 6970M graphics card and two external monitors. I don't know if it's related but after installing the 2013-003 security update that came out on July 2, 2013, my iMac's display randomly shuts off. Up until yesterday (July 3, 2013, which is when I installed the security update), there were no problems.


When the display turns off, sometimes putting the computer to sleep and waking it back up will fix the problem. Sometimes restarting the computer will fix the problem. Sometimes, I have to shut if off, unplug the Thunderbolt cables from the iMac, turn the iMac on, then plug in the Thunderbolt cables again.


The frustrating part is that none of these solutions work consistently. I'll be in the middle of doing something and the display just turns off so I have to spend 5 minutes trying various things just to get the built-in display working.


I will paste the log from Console below. As far as I can tell, 12:51PM is when the display just turned off, and 1:07PM is when the display just turned back on. I'm not sure why though. If anyone can help, that would be greatly appreciated. Thank you!!



7/4/13 12:48:54.574 PM GoogleSoftwareUpdateDaemon[1176]: -[KeystoneDaemon main] GoogleSoftwareUpdateDaemon inactive, shutdown.

7/4/13 12:51:09.473 PM LKDCHelper[1191]: Starting (uid=501)

7/4/13 12:51:24.046 PM WindowServer[81]: Received display connect changed for display 0x42801c0

7/4/13 12:51:24.048 PM WindowServer[81]: Received display connect changed for display 0x2b283751

7/4/13 12:51:24.115 PM WindowServer[81]: Created shield window 0x165 for display 0x2b283751

7/4/13 12:51:24.115 PM WindowServer[81]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1

7/4/13 12:51:24.115 PM WindowServer[81]: Received display connect changed for display 0x2b10568e

7/4/13 12:51:24.127 PM WindowServer[81]: Created shield window 0x166 for display 0x2b10568e

7/4/13 12:51:24.127 PM WindowServer[81]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1

7/4/13 12:51:24.128 PM WindowServer[81]: Received display connect changed for display 0x3f003f

7/4/13 12:51:24.128 PM WindowServer[81]: Received display connect changed for display 0x3f0040

7/4/13 12:51:24.392 PM WindowServer[81]: MPServiceForDisplayDevice: Invalid device alias (0)

7/4/13 12:51:24.392 PM WindowServer[81]: MPServiceForDisplayDevice: Invalid device alias (0)

7/4/13 12:51:24.392 PM WindowServer[81]: Display 0x2b10568e: GL mask 0x4; bounds (0, 0)[1080 x 1920], 51 modes available

Main, Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model 405f, S/N 4159414c, Unit 2, Rotation 90

UUID 0x000010ac0000405f4159414c00000000, ColorProfile { 2, "DELL U2211H"}

7/4/13 12:51:24.393 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 12:51:24.393 PM WindowServer[81]: Display 0x003f0040: GL mask 0x10; bounds (4664, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 4, Rotation 0

UUID 0xffffffffffffffffffffffff003f0040

7/4/13 12:51:24.393 PM WindowServer[81]: Display 0x003f003f: GL mask 0x8; bounds (4665, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0

UUID 0xffffffffffffffffffffffff003f003f

7/4/13 12:51:24.393 PM WindowServer[81]: Display 0x2b283751: GL mask 0x2; bounds (-1920, 174)[1920 x 1200], 69 modes available

Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model a010, S/N 30573353, Unit 1, Rotation 0

UUID 0x000010ac0000a0103057335300000000, ColorProfile { 4, "DELL 2405FPW"}

7/4/13 12:51:24.393 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 12:51:24.393 PM WindowServer[81]: Display 0x003f003c: GL mask 0x1; bounds (1080, 180)[1 x 1], 1 modes available

off-line, enabled, boot, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 0, Rotation 0

UUID 0xffffffffffffffffffffffff003f003c, ColorProfile { 3, "iMac"}

7/4/13 12:51:24.393 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 12:51:24.707 PM WindowServer[81]: Created shield window 0x167 for display 0x2b10568e

7/4/13 12:51:24.707 PM WindowServer[81]: Created shield window 0x168 for display 0x003f0040

7/4/13 12:51:24.707 PM WindowServer[81]: Created shield window 0x169 for display 0x003f003f

7/4/13 12:51:24.711 PM WindowServer[81]: Created shield window 0x16a for display 0x2b283751

7/4/13 12:51:24.712 PM WindowServer[81]: Created shield window 0x16b for display 0x003f003c

7/4/13 12:51:24.715 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2: Startup Mode 1080 x 1920, CGSThirtytwoBitColor, Resolution 1, IOMode 0x80000000, IODepth 0x1, IOReturn 0xe00002bc

7/4/13 12:51:24.715 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1: Startup Mode 1920 x 1200, CGSThirtytwoBitColor, Resolution 1, IOMode 0x43e, IODepth 0x1, IOReturn 0x0

7/4/13 12:51:24.715 PM WindowServer[81]: Display added

7/4/13 12:51:24.715 PM WindowServer[81]: Display removed

7/4/13 12:51:24.718 PM WindowServer[81]: Display 0x2b10568e: GL mask 0x4; bounds (0, 0)[1080 x 1920], 51 modes available

Main, Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model 405f, S/N 4159414c, Unit 2, Rotation 90

UUID 0x000010ac0000405f4159414c00000000, ColorProfile { 2, "DELL U2211H"}

7/4/13 12:51:24.718 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 12:51:24.718 PM WindowServer[81]: Display 0x003f0040: GL mask 0x10; bounds (2104, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 4, Rotation 0

UUID 0xffffffffffffffffffffffff003f0040

7/4/13 12:51:24.718 PM WindowServer[81]: Display 0x003f003f: GL mask 0x8; bounds (2105, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0

UUID 0xffffffffffffffffffffffff003f003f

7/4/13 12:51:24.718 PM WindowServer[81]: Display 0x2b283751: GL mask 0x2; bounds (-1920, 174)[1920 x 1200], 69 modes available

Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model a010, S/N 30573353, Unit 1, Rotation 0

UUID 0x000010ac0000a0103057335300000000, ColorProfile { 4, "DELL 2405FPW"}

7/4/13 12:51:24.718 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 12:51:24.719 PM WindowServer[81]: Display 0x003f003c: GL mask 0x1; bounds (2106, 180)[1 x 1], 1 modes available

off-line, enabled, boot, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 0, Rotation 0

UUID 0xffffffffffffffffffffffff003f003c, ColorProfile { 3, "iMac"}

7/4/13 12:51:24.720 PM WindowServer[81]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x2b10568e device: 0x10ffb5a10 isBackBuffered: 0 numComp: 1 numDisp: 3

7/4/13 12:51:24.729 PM WindowServer[81]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x2b283751 device: 0x10ffb5b90 isBackBuffered: 1 numComp: 3 numDisp: 3

7/4/13 12:51:26.116 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 12:51:26.128 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 12:51:26.210 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.210 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.210 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.210 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.224 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.224 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.225 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.225 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.712 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 12:51:26.714 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 12:51:26.741 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.741 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.741 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.741 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.755 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.755 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.756 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:26.756 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 12:51:31.000 PM kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=1202[ksadmin] clearing CS_VALID

7/4/13 12:51:32.000 PM kernel[0]: CODE SIGNING: cs_invalid_page(0x1000): p=1208[ksadmin] clearing CS_VALID

7/4/13 12:53:31.589 PM VDCAssistant[1224]: AVF encoder error: fail to create accelerator instance

7/4/13 12:53:32.078 PM VDCAssistant[1224]: AVF encoder error: fail to create accelerator instance

7/4/13 12:56:32.911 PM mdwrite[1237]: [ERROR] [0.000s] com.apple. UBItemStatusNotification.c:805 _do_UBItemStatusNotificationRegisterURLs() can't find realpath for "/Users/william/Library/Mobile Documents/com~apple~system~spotlight/mdlabels", was blocked at "/Users/william/Library/Mobile Documents": 2 (No such file or directory)

7/4/13 12:56:32.911 PM mdwrite[1237]: [ERROR] [0.001s] com.apple. UBItemStatusNotification.c:805 _do_UBItemStatusNotificationRegisterURLs() can't find realpath for "/Users/william/Library/Mobile Documents/com~apple~system~spotlight/mdlabels", was blocked at "/Users/william/Library/Mobile Documents": 2 (No such file or directory)

7/4/13 1:01:20.454 PM com.apple.launchd.peruser.501[162]: (com.apple.KerberosHelper.LKDCHelper[1191]) Exited with code: 1

7/4/13 1:04:37.772 PM coreaudiod[136]: Disabled automatic stack shots because audio IO is active

7/4/13 1:04:41.069 PM coreaudiod[136]: Enabled automatic stack shots because audio IO is inactive

7/4/13 1:07:27.586 PM coreaudiod[136]: Disabled automatic stack shots because audio IO is active

7/4/13 1:07:27.772 PM coreaudiod[136]: Enabled automatic stack shots because audio IO is inactive

7/4/13 1:07:35.439 PM WindowServer[81]: CGXDeferSurfaces : Invalid source window 412

7/4/13 1:07:38.605 PM com.apple.SecurityServer[15]: Session 100087 created

7/4/13 1:07:38.618 PM com.apple.qtkittrustedmoviesservice[1291]: objc[1291]: Class TSSandboxPrefs is implemented in both /Library/Frameworks/TSLicense.framework/Versions/A/TSLicense and /Library/QuickTime/Flip4Mac WMV Import.component/Contents/MacOS/Flip4Mac WMV Import. One of the two will be used. Which one is undefined.

7/4/13 1:07:38.739 PM com.apple.qtkittrustedmoviesservice[1291]: objc[1291]: Class TSSandboxPrefs is implemented in both /Library/Frameworks/TSLicense.framework/Versions/A/TSLicense and /Library/Audio/Plug-Ins/Components/Flip4Mac WMA Import.component/Contents/MacOS/Flip4Mac WMA Import. One of the two will be used. Which one is undefined.

7/4/13 1:07:40.036 PM WindowServer[81]: Received display connect changed for display 0x3f003c

7/4/13 1:07:40.050 PM WindowServer[81]: Created shield window 0x1af for display 0x042801c0

7/4/13 1:07:40.050 PM WindowServer[81]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1

7/4/13 1:07:40.051 PM WindowServer[81]: Received display connect changed for display 0x2b283751

7/4/13 1:07:40.065 PM WindowServer[81]: Created shield window 0x1b0 for display 0x2b283751

7/4/13 1:07:40.065 PM WindowServer[81]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1

7/4/13 1:07:40.066 PM WindowServer[81]: Received display connect changed for display 0x2b10568e

7/4/13 1:07:40.079 PM WindowServer[81]: Created shield window 0x1b1 for display 0x2b10568e

7/4/13 1:07:40.079 PM WindowServer[81]: handle_will_sleep_auth_and_shield_windows: no action for lock state 1

7/4/13 1:07:40.080 PM WindowServer[81]: Received display connect changed for display 0x3f003f

7/4/13 1:07:40.080 PM WindowServer[81]: Received display connect changed for display 0x3f0040

7/4/13 1:07:40.337 PM WindowServer[81]: MPServiceForDisplayDevice: Invalid device alias (0)

7/4/13 1:07:40.337 PM WindowServer[81]: MPServiceForDisplayDevice: Invalid device alias (0)

7/4/13 1:07:40.337 PM WindowServer[81]: Display 0x2b10568e: GL mask 0x4; bounds (0, 0)[1080 x 1920], 51 modes available

Main, Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model 405f, S/N 4159414c, Unit 2, Rotation 90

UUID 0x000010ac0000405f4159414c00000000, ColorProfile { 2, "DELL U2211H"}

7/4/13 1:07:40.337 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 1:07:40.337 PM WindowServer[81]: Display 0x003f0040: GL mask 0x10; bounds (2104, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 4, Rotation 0

UUID 0xffffffffffffffffffffffff003f0040

7/4/13 1:07:40.337 PM WindowServer[81]: Display 0x003f003f: GL mask 0x8; bounds (2105, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0

UUID 0xffffffffffffffffffffffff003f003f

7/4/13 1:07:40.337 PM WindowServer[81]: Display 0x2b283751: GL mask 0x2; bounds (-1920, 174)[1920 x 1200], 69 modes available

Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model a010, S/N 30573353, Unit 1, Rotation 0

UUID 0x000010ac0000a0103057335300000000, ColorProfile { 4, "DELL 2405FPW"}

7/4/13 1:07:40.337 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 1:07:40.337 PM WindowServer[81]: Display 0x042801c0: GL mask 0x1; bounds (1080, 174)[2560 x 1440], 36 modes available

Active, on-line, enabled, built-in, boot, Vendor 610, Model a007, S/N 0, Unit 0, Rotation 0

UUID 0x000006100000a00700000000042801c0, ColorProfile { 3, "iMac"}

7/4/13 1:07:41.682 PM com.apple.qtkitserver[1290]: objc[1290]: Class TSSandboxPrefs is implemented in both /Library/Frameworks/TSLicense.framework/Versions/A/TSLicense and /Library/QuickTime/Flip4Mac WMV Import.component/Contents/MacOS/Flip4Mac WMV Import. One of the two will be used. Which one is undefined.

7/4/13 1:07:41.799 PM com.apple.qtkitserver[1290]: objc[1290]: Class TSSandboxPrefs is implemented in both /Library/Frameworks/TSLicense.framework/Versions/A/TSLicense and /Library/Audio/Plug-Ins/Components/Flip4Mac WMA Import.component/Contents/MacOS/Flip4Mac WMA Import. One of the two will be used. Which one is undefined.

7/4/13 1:07:42.051 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 1:07:42.067 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 1:07:42.080 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 1:07:42.087 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.087 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.089 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.104 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.104 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.105 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.108 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.109 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.110 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.119 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.120 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.121 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.122 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.123 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.123 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.135 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.136 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:42.136 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:43.024 PM WindowServer[81]: Created shield window 0x1b2 for display 0x2b10568e

7/4/13 1:07:43.025 PM WindowServer[81]: Created shield window 0x1b3 for display 0x003f0040

7/4/13 1:07:43.025 PM WindowServer[81]: Created shield window 0x1b4 for display 0x003f003f

7/4/13 1:07:43.029 PM WindowServer[81]: Created shield window 0x1b5 for display 0x2b283751

7/4/13 1:07:43.035 PM WindowServer[81]: Created shield window 0x1b6 for display 0x042801c0

7/4/13 1:07:43.042 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2: Startup Mode 1080 x 1920, CGSThirtytwoBitColor, Resolution 1, IOMode 0x80001000, IODepth 0x1, IOReturn 0xe00002bc

7/4/13 1:07:43.042 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1: Startup Mode 1920 x 1200, CGSThirtytwoBitColor, Resolution 1, IOMode 0x43e, IODepth 0x1, IOReturn 0x0

7/4/13 1:07:43.042 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0: Startup Mode 2560 x 1440, CGSThirtytwoBitColor, Resolution 1, IOMode 0x43e, IODepth 0x1, IOReturn 0x0

7/4/13 1:07:43.042 PM WindowServer[81]: Display added

7/4/13 1:07:43.042 PM WindowServer[81]: Display removed

7/4/13 1:07:43.047 PM WindowServer[81]: Display 0x2b10568e: GL mask 0x4; bounds (0, 0)[1080 x 1920], 51 modes available

Main, Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model 405f, S/N 4159414c, Unit 2, Rotation 90

UUID 0x000010ac0000405f4159414c00000000, ColorProfile { 2, "DELL U2211H"}

7/4/13 1:07:43.047 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 1:07:43.047 PM WindowServer[81]: Display 0x003f0040: GL mask 0x10; bounds (4664, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 4, Rotation 0

UUID 0xffffffffffffffffffffffff003f0040

7/4/13 1:07:43.047 PM WindowServer[81]: Display 0x003f003f: GL mask 0x8; bounds (4665, 0)[1 x 1], 1 modes available

off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0

UUID 0xffffffffffffffffffffffff003f003f

7/4/13 1:07:43.047 PM WindowServer[81]: Display 0x2b283751: GL mask 0x2; bounds (-1920, 174)[1920 x 1200], 69 modes available

Active, on-line, enabled, OpenGL-accel, Vendor 10ac, Model a010, S/N 30573353, Unit 1, Rotation 0

UUID 0x000010ac0000a0103057335300000000, ColorProfile { 4, "DELL 2405FPW"}

7/4/13 1:07:43.047 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 1:07:43.047 PM WindowServer[81]: Display 0x042801c0: GL mask 0x1; bounds (1080, 180)[2560 x 1440], 36 modes available

Active, on-line, enabled, built-in, boot, Vendor 610, Model a007, S/N 0, Unit 0, Rotation 0

UUID 0x000006100000a00700000000042801c0, ColorProfile { 3, "iMac"}

7/4/13 1:07:43.047 PM WindowServer[81]: GLCompositor: GL renderer id 0x01021b05, GL mask 0x0000001f, accelerator 0x000048fb, unit 0, caps QEX|QGL|MIPMAP, vram 1024 MB

texture units 8, texture max 16384, viewport max {16384, 16384}, extensions FPRG|NPOT|GLSL|FLOAT

7/4/13 1:07:43.058 PM WindowServer[81]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x2b10568e device: 0x10ffb5a10 isBackBuffered: 0 numComp: 1 numDisp: 3

7/4/13 1:07:43.078 PM WindowServer[81]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x042801c0 device: 0x10ffb5110 isBackBuffered: 1 numComp: 3 numDisp: 3

7/4/13 1:07:43.081 PM WindowServer[81]: MPAccessSurfaceForDisplayDevice: Set up page flip mode on display 0x2b283751 device: 0x10ffb5b90 isBackBuffered: 1 numComp: 3 numDisp: 3

7/4/13 1:07:45.038 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 1:07:45.040 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 1:07:45.040 PM WindowServer[81]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.

7/4/13 1:07:45.077 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.078 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.078 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.078 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.078 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.079 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.079 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.079 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.079 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.096 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.096 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.096 PM WindowServer[81]: Display 0x2b10568e: MappedDisplay Unit 2; ColorProfile { 2, "DELL U2211H"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.096 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.098 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.098 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.098 PM WindowServer[81]: Display 0x042801c0: MappedDisplay Unit 0; ColorProfile { 3, "iMac"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.098 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:45.099 PM WindowServer[81]: Display 0x2b283751: MappedDisplay Unit 1; ColorProfile { 4, "DELL 2405FPW"}; TransferFormula (1.000000, 1.000000, 1.000000)

7/4/13 1:07:46.222 PM coreaudiod[136]: Disabled automatic stack shots because audio IO is active

7/4/13 1:07:47.712 PM Dock[176]: no information back from LS about running process

7/4/13 1:07:48.063 PM com.apple.qtkitserver[1290]: objc[1290]: Class TSSandboxPrefs is implemented in both /Library/Frameworks/TSLicense.framework/Versions/A/TSLicense and /Library/QuickTime/Flip4Mac WMV Advanced.component/Contents/MacOS/Flip4Mac WMV Advanced. One of the two will be used. Which one is undefined.

7/4/13 1:07:48.138 PM coreaudiod[136]: Enabled automatic stack shots because audio IO is inactive

7/4/13 1:07:49.626 PM coreaudiod[136]: Disabled automatic stack shots because audio IO is active

7/4/13 1:07:49.000 PM kernel[0]: Sandbox: sandboxd(1308) deny mach-lookup com.apple.coresymbolicationd

7/4/13 1:07:49.649 PM coreaudiod[136]: Enabled automatic stack shots because audio IO is inactive

7/4/13 1:07:49.656 PM coreaudiod[136]: Disabled automatic stack shots because audio IO is active

7/4/13 1:07:49.819 PM coreaudiod[136]: Enabled automatic stack shots because audio IO is inactive

7/4/13 1:07:50.000 PM kernel[0]: Sandbox: com.apple.qtkits(1290) deny file-read-data /Volumes/et1/untitled folder

7/4/13 1:07:50.000 PM kernel[0]: Sandbox: com.apple.qtkits(1290) deny file-read-data /Volumes/et1/untitled folder

7/4/13 1:07:53.051 PM Dock[176]: no information back from LS about running process

7/4/13 1:07:55.127 PM LKDCHelper[1315]: Starting (uid=501)

7/4/13 1:07:55.380 PM com.apple.ShareKitHelper[433]: --warning: [ShareKit-XPC] Received XPC_ERROR_CONNECTION_INVALID

7/4/13 1:07:55.381 PM com.apple.ShareKitHelper[433]: --warning: [ShareKit-XPC] connectionWithClientInterrupted

7/4/13 1:07:55.381 PM com.apple.ShareKitHelper[433]: --warning: [ShareKit] Cancel UI for running services with Client PID: 1304

7/4/13 1:07:55.382 PM WindowServer[81]: CGXDeferSurfaces : Invalid source window 453

7/4/13 1:07:55.382 PM WindowServer[81]: CGXDeferSurfaces : Invalid source window 451

7/4/13 1:07:58.153 PM sandboxd[1308]: ([1290]) com.apple.qtkits(1290) deny file-read-data /Volumes/et1/untitled folder

7/4/13 1:07:58.235 PM sandboxd[1308]: ([1290]) com.apple.qtkits(1290) deny file-read-data /Volumes/et1/untitled folder

iMac, OS X Mountain Lion (10.8.4)

Posted on Jul 4, 2013 1:13 PM

Reply
25 replies

Jul 5, 2013 6:19 PM in response to mrbofus

Hmmm, quite curious, I slightly suspect some power issue, possibly USB?


Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.


If that doesn't help Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.


Does it work in the new account?

Jul 8, 2013 1:30 AM in response to BDAqua

Nope, those steps didn't help. Today, it's been randomly turning off but then turning back on five seconds later. Which I guess is better than before, since I don't have to keep rearranging my windows anymore.


But, it's still pretty darn annoying. And I'm hoping that it was something in the 2013-003 security update, because I had zero problems before then, and it seems like it would be far too much of a coincidence for this issue to start happening right after I installed that update.


I submitted a bug report to Apple, but unsurprisingly, haven't heard back from them at all.

Jul 9, 2013 1:57 PM in response to BDAqua

That does seem to be somewhat related; mine isn't flashing over and over, and for me, it's the built-in iMac display that isn't functioning properly. The external monitors have never spontaneously turned off.


Thank you for pointing that thread out to me though!


As for USB stuff, nothing is connected to the monitors themselves. On my iMac, I have a secondary webcam plugged into one of the USB ports, a printer in the second, and the occasional iPhone and iPad in the third when I sync those devices. The fourth remains open for when I need to plug in thumb drives or external drives.

Aug 14, 2013 11:52 PM in response to mrbofus

Just as an update:


It seems like it's a sleep related issue, in my case, at least. If I don't let my iMac go to sleep [ System Preferences -> Energy Saver -> Computer Sleep: Never ], then all three monitors stay on. If I let the iMac go to sleep, there's a pretty good chance the iMac's screen won't come back on and then randomly turn on and off.


Ideally, I would like my iMac to go to sleep so it's not using power when I'm not using it, but for now, I guess I'll have to keep it from sleeping.


If anyone else experiencing this issue would like to try setting their computer to not go to sleep and seeing if that fixes it, please do so and report back to see if we can try to isolate the cause.

Aug 15, 2013 4:23 AM in response to mrbofus

Sometimes multidisplay arrangements will not stick in OS X after performing software or hardware modifications.


This could be corruption in the settings file for display arrangements, which is a common reason why settings for any application or process cannot be saved or restored. Try to clear the window server settings and have them be rewritten by the program, which can be done by deleting a certain file


Firstly disconnect your external display


Then go to the Finder and choose the Library option from the Go menu (hold the Option key to reveal the Library in this menu if it is missing). Then navigate to the Preferences/ByHost folder in the window that appears, and remove the file called "com.apple.windowserver.NUMBER.plist


After performing each of these steps, try logging out and logging back into your account and connecting the external display..


NOTE: This will change your display settings to default as well so you may have to re-adjust afterwards


Hope this helps!


Aug 23, 2013 10:34 PM in response to BenniBenassi

BenniBenassi wrote:



worth a try dont you think?


Oh, definitely! I didn't mean to imply that it wasn't worth a try. I was also incomplete with my response. I did try that and that had no effect. The end result is still the same. If I let my computer go to sleep, most of the time, the iMac display is very glitchy. If I don't let the computer go to sleep, the iMac monitor is mostly fine and is only occasionally glitchy. So for now, the only solution I have found is to not let the iMac sleep at all.

iMac display turning off randomly with external monitors

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