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disconnect+reconnect external display = washed out image

875 Views 10 Replies Latest reply: Feb 16, 2013 5:27 AM by gmarinov RSS
gmarinov Level 1 Level 1 (30 points)
Currently Being Moderated
Sep 25, 2011 6:44 AM

hi guys


I need some expert help on this. Using a Dell E178 WFP external display on my 2010 Macbook Pro via mini-DVI-to-VGA adapter. This display has no EDID it seems so I use SwitchResX to create the necessary resolution override (1440x900). SwitchResX has nothing such as daemons or helpers installed on top, so this boils down to graphics drivers.


My problem: When I reboot the machine, the display has the necessary brightness, contrast, and colour balance. If I unplug the display, wait a sec, then plug it back in, the image comes up very bright and washed out, and I can't get a "true" black out of the display.


What this isn't: I have a ColorSync profile, and make sure it is successfullly loaded, i.e. I go through the trouble of opening up system preferences>displays>color to make sure it reloads. This is not a ColorSync problem. It is not the 2.2 vs 1.8 gamma problem either. Ctrl+shift+eject does not fix it. Creating a new colour profile does not fix it either. The usual SMC, permissions, safe boot, etc tricks don't work either.


Apple engineers have sent me a copy of TimingSnoop but were baffled by the display having a "fake" EDID (when run without SwitchResX TS detects no EDID at all). Since I refused to roll back my entire system to 10.6.4 or uninstall SwitchResX (it does not interfere??) they closed the bug stating "insufficient information".


10.6.4 did not have this problem, and my hardware is perfectly fine.

Rolling back the graphics to 10.6.4 fixes this issue (but creates other issues)


I'm looking for information on this. Has anyone had the same happen? Is it confined to sans-EDID displays?

Have googled a lot but I'm running out of search terms... Anything could be of help?


Thanks in advance.

macbook pro intel, Mac OS X (10.6.8), i5, 8gb ram, hr ag
  • X423424X Level 6 Level 6 (14,190 points)

    What happens if you click Detect Displays in the displays preferences?

  • chillmaster_D Calculating status...

    got the exact same thing, i have to reboot each time to get normal colors again, really annoying

  • chillmaster_D Level 1 Level 1 (0 points)


    I have a 2010 macbook pro 15" 2,4ghz i5, 4gb, with 330m 256mb nvidia gpu, running on 10.6.8 snow leopard

    I have found that a lot of people are experiencing the same problem. I am using a different display, a Samsung t240 24" with 1920x1200 resolution.

    I do not know if has something to do with EDID as that goes beyond my expertise, neither have i tried timingsnoop. it does seem likely that the nvidia chip resets.
    Alot of people say the fix is to simply go to the colors tab at the system preferences > display. But for me that does nothing, neither does Detect Display.


    The problem happens like this: i open my macbook from sleep mode, it awakes, i connect my external screen and then the colors on my external screen are desaturated/ washed out, the blacks are not as black etc.

    I leave it plugged in and reboot, problem "solved", the colors on my external screen are natural and saturated. If i plug out my external screen and plug it back in at this point, the colors are back to being desaturated/washed out.

  • Darkken Calculating status...

    I am having this same issue with my macbook pro 2010 i5 2.4 330m nvidia as well. I have tested the same exact cabling and display device with my iMac 2009 core 2 duo 3.06 radeon 4850 and my iMac's color looks perfectly fine. It is quite frustrating trying to find the cause even though it is a very specific use case that produces it.


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