On 2 August 2012 20:31, Michel Dänzer <daen...@debian.org> wrote:
> Thanks. That's not what we generally call 'tearing' but looks like some
> kind of intermittent display corruption.
>
> Unfortunately, I don't have any ideas offhand what could cause that.

I did some more testing and it seems as though the monitor,
combination of identical monitor models or VGA port on the monitors
might be the issue.

The monitors I am using are identical AOC's.  Product Name:
e2250Swda, Model No:  215LM00019.  I had a older spare Benq monitor
E2200HD with native resolution of 1920x1080 and swapped it with the
VGA connected AOC.  Everything worked fine on both displays with
1920x1080 without disabling EXAPixmaps!
I then swapped it around so AOC on VGA and Benq on DVI and the
corruption came back.  I also swapped out the AOC's in case the issue
was with one of them but same problem on both.

Previously even if I disabled the VGA port with the AOC attached to
it, the AOC on the DVI port would still get display corruption.  With
the Benq connected to VGA but disabled no corruption occurs on (either
of) the DVI connected AOC.

I have attached an xrandr --verbose for both combinations in case it
shows something useful.  I couldn't see anything that might explain
why sorry.

Thanks again.

James
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
DVI-0 connected 1920x1080+0+0 (0x55) normal (normal left inverted right x axis 
y axis) 477mm x 268mm
        Identifier: 0x51
        Timestamp:  324965
        Subpixel:   horizontal rgb
        Gamma:      1.0:1.0:1.0
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        underscan hborder: 0 (0x00000000)       range:  (0,128)
        underscan:      off
                supported: off          on           auto        
        coherent: 1 (0x00000001)        range:  (0,1)
  1920x1080 (0x55)  148.5MHz +HSync +VSync *current +preferred
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
        v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
  1680x1050 (0x56)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1280x1024 (0x57)  135.0MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock   80.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   75.0Hz
  1280x1024 (0x58)  108.0MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
  1440x900 (0x59)  136.8MHz -HSync +VSync
        h: width  1440 start 1536 end 1688 total 1936 skew    0 clock   70.6KHz
        v: height  900 start  903 end  909 total  942           clock   75.0Hz
  1440x900 (0x5a)  106.5MHz -HSync +VSync
        h: width  1440 start 1520 end 1672 total 1904 skew    0 clock   55.9KHz
        v: height  900 start  903 end  909 total  934           clock   59.9Hz
  1280x960 (0x5b)  108.0MHz +HSync +VSync
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
        v: height  960 start  961 end  964 total 1000           clock   60.0Hz
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        v: height  800 start  803 end  809 total  831           clock   59.8Hz
  1152x864 (0x5d)  108.0MHz +HSync +VSync
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        v: height  864 start  865 end  868 total  900           clock   75.0Hz
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        h: width  1152 start 1208 end 1328 total 1504 skew    0 clock   44.7KHz
        v: height  720 start  721 end  724 total  746           clock   60.0Hz
  1024x768 (0x5f)   78.8MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock   60.1KHz
        v: height  768 start  769 end  772 total  800           clock   75.1Hz
  1024x768 (0x60)   65.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  832x624 (0x61)   57.3MHz -HSync -VSync
        h: width   832 start  864 end  928 total 1152 skew    0 clock   49.7KHz
        v: height  624 start  625 end  628 total  667           clock   74.6Hz
  800x600 (0x62)   49.5MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock   46.9KHz
        v: height  600 start  601 end  604 total  625           clock   75.0Hz
  800x600 (0x63)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  640x480 (0x64)   31.5MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock   37.5KHz
        v: height  480 start  481 end  484 total  500           clock   75.0Hz
  640x480 (0x65)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   60.0Hz
  720x400 (0x66)   28.3MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock   31.5KHz
        v: height  400 start  412 end  414 total  449           clock   70.1Hz
LVDS connected (normal left inverted right x axis y axis)
        Identifier: 0x52
        Timestamp:  324965
        Subpixel:   horizontal rgb
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        v: height  480 start  483 end  493 total  500           clock   59.7Hz
  720x480 (0x6e)   26.8MHz -HSync +VSync
        h: width   720 start  744 end  808 total  896 skew    0 clock   29.9KHz
        v: height  480 start  483 end  493 total  500           clock   59.7Hz
  640x480 (0x6f)   23.8MHz -HSync +VSync
        h: width   640 start  664 end  720 total  800 skew    0 clock   29.7KHz
        v: height  480 start  483 end  487 total  500           clock   59.4Hz
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
        Identifier: 0x53
        Timestamp:  324965
        Subpixel:   horizontal rgb
        Clones:    
        CRTCs:      0 1
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        coherent: 1 (0x00000001)        range:  (0,1)
VGA-0 connected 1920x1080+1920+0 (0x55) normal (normal left inverted right x 
axis y axis) 477mm x 268mm
        Identifier: 0x54
        Timestamp:  324965
        Subpixel:   no subpixels
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
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        load detection: 1 (0x00000001)  range:  (0,1)
  1920x1080 (0x55)  148.5MHz +HSync +VSync *current +preferred
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
        v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
  1680x1050 (0x56)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1280x1024 (0x57)  135.0MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock   80.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   75.0Hz
  1280x1024 (0x58)  108.0MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
  1440x900 (0x5a)  106.5MHz -HSync +VSync
        h: width  1440 start 1520 end 1672 total 1904 skew    0 clock   55.9KHz
        v: height  900 start  903 end  909 total  934           clock   59.9Hz
  1280x960 (0x5b)  108.0MHz +HSync +VSync
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
        v: height  960 start  961 end  964 total 1000           clock   60.0Hz
  1280x720 (0x70)   74.4MHz -HSync +VSync
        h: width  1280 start 1336 end 1472 total 1664 skew    0 clock   44.7KHz
        v: height  720 start  721 end  724 total  746           clock   60.0Hz
  1024x768 (0x5f)   78.8MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock   60.1KHz
        v: height  768 start  769 end  772 total  800           clock   75.1Hz
  1024x768 (0x71)   75.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1328 skew    0 clock   56.5KHz
        v: height  768 start  771 end  777 total  806           clock   70.1Hz
  1024x768 (0x60)   65.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  832x624 (0x61)   57.3MHz -HSync -VSync
        h: width   832 start  864 end  928 total 1152 skew    0 clock   49.7KHz
        v: height  624 start  625 end  628 total  667           clock   74.6Hz
  800x600 (0x72)   50.0MHz +HSync +VSync
        h: width   800 start  856 end  976 total 1040 skew    0 clock   48.1KHz
        v: height  600 start  637 end  643 total  666           clock   72.2Hz
  800x600 (0x62)   49.5MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock   46.9KHz
        v: height  600 start  601 end  604 total  625           clock   75.0Hz
  800x600 (0x63)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  800x600 (0x73)   36.0MHz +HSync +VSync
        h: width   800 start  824 end  896 total 1024 skew    0 clock   35.2KHz
        v: height  600 start  601 end  603 total  625           clock   56.2Hz
  640x480 (0x74)   31.5MHz -HSync -VSync
        h: width   640 start  664 end  704 total  832 skew    0 clock   37.9KHz
        v: height  480 start  489 end  491 total  520           clock   72.8Hz
  640x480 (0x64)   31.5MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock   37.5KHz
        v: height  480 start  481 end  484 total  500           clock   75.0Hz
  640x480 (0x75)   30.2MHz -HSync -VSync
        h: width   640 start  704 end  768 total  864 skew    0 clock   35.0KHz
        v: height  480 start  483 end  486 total  525           clock   66.7Hz
  640x480 (0x65)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   60.0Hz
  720x400 (0x66)   28.3MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock   31.5KHz
        v: height  400 start  412 end  414 total  449           clock   70.1Hz
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
DVI-0 connected 1920x1080+0+0 (0x55) normal (normal left inverted right x axis 
y axis) 477mm x 268mm
        Identifier: 0x51
        Timestamp:  1246133
        Subpixel:   horizontal rgb
        Gamma:      1.0:1.0:1.0
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        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock   67.5KHz
        v: height 1080 start 1084 end 1089 total 1125           clock   60.0Hz
  1680x1050 (0x56)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1280x1024 (0x57)  135.0MHz +HSync +VSync
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  1440x900 (0x59)  106.5MHz -HSync +VSync
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        v: height  960 start  961 end  964 total 1000           clock   60.0Hz
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        v: height  720 start  721 end  724 total  746           clock   60.0Hz
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        v: height  768 start  769 end  772 total  800           clock   75.1Hz
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        v: height  768 start  771 end  777 total  806           clock   70.1Hz
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        v: height  768 start  771 end  777 total  806           clock   60.0Hz
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        h: width   800 start  816 end  896 total 1056 skew    0 clock   46.9KHz
        v: height  600 start  601 end  604 total  625           clock   75.0Hz
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        v: height  600 start  601 end  605 total  628           clock   60.3Hz
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        v: height  600 start  601 end  603 total  625           clock   56.2Hz
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        v: height  480 start  489 end  491 total  520           clock   72.8Hz
  640x480 (0x65)   31.5MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock   37.5KHz
        v: height  480 start  481 end  484 total  500           clock   75.0Hz
  640x480 (0x66)   30.2MHz -HSync -VSync
        h: width   640 start  704 end  768 total  864 skew    0 clock   35.0KHz
        v: height  480 start  483 end  486 total  525           clock   66.7Hz
  640x480 (0x67)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   60.0Hz
  720x400 (0x68)   28.3MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock   31.5KHz
        v: height  400 start  412 end  414 total  449           clock   70.1Hz
LVDS connected (normal left inverted right x axis y axis)
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        Timestamp:  1246133
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        v: height  800 start  804 end  808 total  820           clock   60.0Hz
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        v: height  800 start  804 end  808 total  820           clock   50.1Hz
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        v: height  720 start  723 end  728 total  748           clock   59.9Hz
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        v: height  768 start  771 end  781 total  798           clock   59.8Hz
  1024x768 (0x6d)   63.5MHz -HSync +VSync
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        v: height  768 start  771 end  775 total  798           clock   59.9Hz
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        v: height  600 start  603 end  607 total  624           clock   59.9Hz
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        v: height  480 start  483 end  493 total  500           clock   59.7Hz
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        v: height  480 start  483 end  493 total  500           clock   59.7Hz
  640x480 (0x71)   23.8MHz -HSync +VSync
        h: width   640 start  664 end  720 total  800 skew    0 clock   29.7KHz
        v: height  480 start  483 end  487 total  500           clock   59.4Hz
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
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        Timestamp:  1246133
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        coherent: 1 (0x00000001)        range:  (0,1)
VGA-0 connected 1920x1080+1920+0 (0x72) normal (normal left inverted right x 
axis y axis) 476mm x 268mm
        Identifier: 0x54
        Timestamp:  1246133
        Subpixel:   no subpixels
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:    
        CRTC:       1
        CRTCs:      0 1
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter: 
        EDID:
                00ffffffffffff0009d10b7945540000
                271201030e2f1a782e3585a656489a24
                125054a56bba710081008140950f8180
                9500b3000101944380907238284080c8
                3500dc0c1100001e000000ff004e3938
                30343134373032360a20000000fd0032
                4c1e5e15000a202020202020000000fc
                0042656e5120453232303048440a00f3
        load detection: 1 (0x00000001)  range:  (0,1)
  1920x1080 (0x72)  173.0MHz +HSync +VSync *current +preferred
        h: width  1920 start 2048 end 2248 total 2576 skew    0 clock   67.2KHz
        v: height 1080 start 1083 end 1088 total 1120           clock   60.0Hz
  1680x1050 (0x56)  146.2MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz
  1280x1024 (0x57)  135.0MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock   80.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   75.0Hz
  1280x1024 (0x58)  108.0MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz
        v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz
  1440x900 (0x73)  136.8MHz -HSync +VSync
        h: width  1440 start 1536 end 1688 total 1936 skew    0 clock   70.6KHz
        v: height  900 start  903 end  909 total  942           clock   75.0Hz
  1440x900 (0x59)  106.5MHz -HSync +VSync
        h: width  1440 start 1520 end 1672 total 1904 skew    0 clock   55.9KHz
        v: height  900 start  903 end  909 total  934           clock   59.9Hz
  1280x960 (0x5a)  108.0MHz +HSync +VSync
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz
        v: height  960 start  961 end  964 total 1000           clock   60.0Hz
  1280x800 (0x74)   83.5MHz +HSync -VSync
        h: width  1280 start 1352 end 1480 total 1680 skew    0 clock   49.7KHz
        v: height  800 start  803 end  809 total  831           clock   59.8Hz
  1152x864 (0x75)  108.0MHz +HSync +VSync
        h: width  1152 start 1216 end 1344 total 1600 skew    0 clock   67.5KHz
        v: height  864 start  865 end  868 total  900           clock   75.0Hz
  1152x720 (0x76)   67.3MHz -HSync +VSync
        h: width  1152 start 1208 end 1328 total 1504 skew    0 clock   44.7KHz
        v: height  720 start  721 end  724 total  746           clock   60.0Hz
  1024x768 (0x5c)   78.8MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock   60.1KHz
        v: height  768 start  769 end  772 total  800           clock   75.1Hz
  1024x768 (0x5e)   65.0MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  832x624 (0x5f)   57.3MHz -HSync -VSync
        h: width   832 start  864 end  928 total 1152 skew    0 clock   49.7KHz
        v: height  624 start  625 end  628 total  667           clock   74.6Hz
  800x600 (0x61)   49.5MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock   46.9KHz
        v: height  600 start  601 end  604 total  625           clock   75.0Hz
  800x600 (0x62)   40.0MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  640x480 (0x65)   31.5MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock   37.5KHz
        v: height  480 start  481 end  484 total  500           clock   75.0Hz
  640x480 (0x67)   25.2MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   60.0Hz
  720x400 (0x68)   28.3MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock   31.5KHz
        v: height  400 start  412 end  414 total  449           clock   70.1Hz

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