Bug#682099: xserver-xorg-video-ati: EXAPixmaps=On screen tearing at high resolution under certain configurations
James Robertson
j at mesrobertson.com
Wed Aug 8 18:01:39 PDT 2012
On 2 August 2012 20:31, Michel Dänzer <daenzer at 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
-------------- next part --------------
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
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1
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0.000000 0.000000 1.000000
filter:
EDID:
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load detection: 1 (0x00000001) range: (0,1)
underscan vborder: 0 (0x00000000) range: (0,128)
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
1280x800 (0x5c) 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 (0x5d) 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 (0x5e) 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 (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
Clones:
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
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scaling mode: Full
supported: None Full Center Full aspect
1280x800 (0x67) 69.5MHz -HSync -VSync +preferred
h: width 1280 start 1304 end 1336 total 1412 skew 0 clock 49.2KHz
v: height 800 start 804 end 808 total 820 clock 60.0Hz
1280x800 (0x68) 57.8MHz -HSync -VSync
h: width 1280 start 1304 end 1336 total 1408 skew 0 clock 41.1KHz
v: height 800 start 804 end 808 total 820 clock 50.1Hz
1280x720 (0x69) 74.5MHz -HSync +VSync
h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 44.8KHz
v: height 720 start 723 end 728 total 748 clock 59.9Hz
1152x768 (0x6a) 71.8MHz -HSync +VSync
h: width 1152 start 1216 end 1328 total 1504 skew 0 clock 47.7KHz
v: height 768 start 771 end 781 total 798 clock 59.8Hz
1024x768 (0x6b) 63.5MHz -HSync +VSync
h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.8KHz
v: height 768 start 771 end 775 total 798 clock 59.9Hz
800x600 (0x6c) 38.2MHz -HSync +VSync
h: width 800 start 832 end 912 total 1024 skew 0 clock 37.4KHz
v: height 600 start 603 end 607 total 624 clock 59.9Hz
848x480 (0x6d) 31.5MHz -HSync +VSync
h: width 848 start 872 end 952 total 1056 skew 0 clock 29.8KHz
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
Transform: 1.000000 0.000000 0.000000
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filter:
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underscan hborder: 0 (0x00000000) range: (0,128)
underscan: off
supported: off on auto
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
Clones:
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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
-------------- next part --------------
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
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
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load detection: 1 (0x00000001) range: (0,1)
underscan vborder: 0 (0x00000000) range: (0,128)
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) 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
1280x720 (0x5b) 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 (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 (0x5d) 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 (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
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v: height 624 start 625 end 628 total 667 clock 74.6Hz
800x600 (0x60) 50.0MHz +HSync +VSync
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v: height 600 start 637 end 643 total 666 clock 72.2Hz
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
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v: height 600 start 601 end 605 total 628 clock 60.3Hz
800x600 (0x63) 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 (0x64) 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 (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)
Identifier: 0x52
Timestamp: 1246133
Subpixel: horizontal rgb
Clones:
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
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filter:
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1280x800 (0x69) 69.5MHz -HSync -VSync +preferred
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v: height 800 start 804 end 808 total 820 clock 60.0Hz
1280x800 (0x6a) 57.8MHz -HSync -VSync
h: width 1280 start 1304 end 1336 total 1408 skew 0 clock 41.1KHz
v: height 800 start 804 end 808 total 820 clock 50.1Hz
1280x720 (0x6b) 74.5MHz -HSync +VSync
h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 44.8KHz
v: height 720 start 723 end 728 total 748 clock 59.9Hz
1152x768 (0x6c) 71.8MHz -HSync +VSync
h: width 1152 start 1216 end 1328 total 1504 skew 0 clock 47.7KHz
v: height 768 start 771 end 781 total 798 clock 59.8Hz
1024x768 (0x6d) 63.5MHz -HSync +VSync
h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.8KHz
v: height 768 start 771 end 775 total 798 clock 59.9Hz
800x600 (0x6e) 38.2MHz -HSync +VSync
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v: height 600 start 603 end 607 total 624 clock 59.9Hz
848x480 (0x6f) 31.5MHz -HSync +VSync
h: width 848 start 872 end 952 total 1056 skew 0 clock 29.8KHz
v: height 480 start 483 end 493 total 500 clock 59.7Hz
720x480 (0x70) 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 (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)
Identifier: 0x53
Timestamp: 1246133
Subpixel: horizontal rgb
Clones:
CRTCs: 0 1
Transform: 1.000000 0.000000 0.000000
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filter:
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underscan hborder: 0 (0x00000000) range: (0,128)
underscan: off
supported: off on auto
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:
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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
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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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