Well, even though this is the 3rd day without encountering any display problems, I spoke too soon!!! My problem is back. I was viewing some web pages on Safari tonight when the screen jerkiness reoccurred. I then looked at the console log and saw a problem again. See the small section of console error log below with Surface Testing messages:
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11/1/15 10:02:45.856 PM quicklookd[5104]: Error returned from iconservicesagent: (null)
11/1/15 10:02:45.857 PM iconservicesagent[3403]: -[ISGenerateImageOp generateImageWithCompletion:] Failed to composit image for descriptor <ISBindingImageDescriptor: 0x7f904d006850>.
11/1/15 10:02:45.857 PM quicklookd[5104]: Error returned from iconservicesagent: (null)
11/1/15 10:02:48.142 PM ACCFinderSync[5322]: host connection <NSXPCConnection: 0x7fb008f34c20> connection from pid 4782 invalidated
11/1/15 10:03:44.844 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:03:44.985 PM WindowServer[3178]: Surface test allowed updates after 40 attempts (160 ms)
11/1/15 10:03:45.255 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:03:58.387 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:04:34.135 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:04:34.602 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:34.934 PM WindowServer[3178]: Surface test allowed updates after 82 attempts (328 ms)
11/1/15 10:04:35.036 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:35.055 PM WindowServer[3178]: Surface test allowed updates after 12 attempts (48 ms)
11/1/15 10:04:35.135 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:35.435 PM WindowServer[3178]: Surface test allowed updates after 75 attempts (300 ms)
11/1/15 10:04:35.670 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:35.931 PM WindowServer[3178]: Surface test allowed updates after 66 attempts (264 ms)
11/1/15 10:04:36.002 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:36.217 PM WindowServer[3178]: Surface test allowed updates after 56 attempts (224 ms)
11/1/15 10:04:37.331 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:04:37.552 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:37.664 PM WindowServer[3178]: Surface test allowed updates after 33 attempts (132 ms)
11/1/15 10:04:38.137 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:04:38.419 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:38.443 PM WindowServer[3178]: Surface test allowed updates after 14 attempts (56 ms)
11/1/15 10:04:38.503 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:38.948 PM WindowServer[3178]: Surface test allowed updates after 107 attempts (428 ms)
11/1/15 10:04:40.354 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:04:44.155 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:44.475 PM WindowServer[3178]: Surface test allowed updates after 79 attempts (316 ms)
11/1/15 10:04:45.324 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:45.479 PM WindowServer[3178]: Surface test allowed updates after 42 attempts (168 ms)
11/1/15 10:04:48.172 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:48.502 PM WindowServer[3178]: Surface test allowed updates after 82 attempts (328 ms)
11/1/15 10:04:57.526 PM Console[5323]: Failed to connect (_consoleX) outlet from (NSApplication) to (ConsoleX): missing setter or instance variable
11/1/15 10:04:57.784 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:58.042 PM WindowServer[3178]: Surface test allowed updates after 65 attempts (260 ms)
11/1/15 10:04:58.167 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:04:58.545 PM WindowServer[3178]: Surface test allowed updates after 91 attempts (364 ms)
11/1/15 10:05:25.813 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:25.841 PM WindowServer[3178]: Surface test allowed updates after 15 attempts (60 ms)
11/1/15 10:05:25.899 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:26.010 PM WindowServer[3178]: Surface test allowed updates after 33 attempts (132 ms)
11/1/15 10:05:26.080 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:26.194 PM WindowServer[3178]: Surface test allowed updates after 34 attempts (136 ms)
11/1/15 10:05:26.195 PM WindowServer[3178]: _CGXRemoveWindowFromWindowMovementGroup: window 0x54b is not attached to window 0x54d
11/1/15 10:05:26.248 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:26.702 PM WindowServer[3178]: Surface test allowed updates after 108 attempts (432 ms)
11/1/15 10:05:43.648 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:43.789 PM WindowServer[3178]: Surface test allowed updates after 40 attempts (160 ms)
11/1/15 10:05:43.999 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:44.158 PM WindowServer[3178]: Surface test allowed updates after 44 attempts (176 ms)
11/1/15 10:05:51.722 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:51.838 PM WindowServer[3178]: Surface test allowed updates after 34 attempts (136 ms)
11/1/15 10:05:51.906 PM WindowServer[3178]: Surface testing disallowed updates for 10 sequential attempts...
11/1/15 10:05:52.343 PM WindowServer[3178]: Surface test allowed updates after 105 attempts (420 ms)
11/1/15 10:06:01.861 PM WindowServer[3178]: MPServiceForDisplayDevice: Invalid device alias (0)
11/1/15 10:06:01.861 PM WindowServer[3178]: Display 0x13c235f5: GL mask 0x20; bounds (0, 0)[3200 x 1800], 138 modes available
Main, Active, on-line, enabled, boot, OpenGL-accel, Vendor e4f, Model 8e1, S/N db0, Unit 5, Rotation 0
UUID 0xbb2cc9937ac04ddd455dbce4db0ac314, ColorSpace { 148653395 }
11/1/15 10:06:01.861 PM WindowServer[3178]: GLCompositor: GL renderer id 0x01021c02, GL mask 0x0000007f, accelerator 0x0000247f, unit 0, caps QEX|MIPMAP, vram 2048 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
11/1/15 10:06:01.861 PM WindowServer[3178]: Display 0x003f0042: GL mask 0x40; bounds (4224, 0)[1 x 1], 2 modes available
off-line, enabled, OpenGL-accel, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 6, Rotation 0
UUID 0xffffffffffffffffffffffffffffffff
11/1/15 10:06:01.861 PM WindowServer[3178]: GLCompositor: GL renderer id 0x01021c02, GL mask 0x0000007f, accelerator 0x0000247f, unit 0, caps QEX|MIPMAP, vram 2048 MB
texture max 16384, viewport max {16384, 16384}, extensions NPOT|GLSL|FLOAT
11/1/15 10:06:01.861 PM WindowServer[3178]: Display 0x003f0043: GL mask 0x80; bounds (4225, 0)[1 x 1], 1 modes available
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Once I turned off Display Scaling in Display control panel, the problem went away. I then immediately turned scaling back on and now not seeing any problems. So I guess if problem only occurs every 2-3 days, I can do what I just did tonight to clear up. Hopefully, this problem will be corrected in 10.11.2 update. 😟
Will let you know here if any new revelations.
Thx.
Paul