The error mentioned here still persists in 7.10. There appears to be
misidentification of the a21p LCD, this causes massive screen tearing.
The problem is solved by replacing the HorizSync, VertRefresh, and
Modelines:
HorizSync 31-77
VertRefresh 50-77
Modeline "640x480" 27.96 640 656 720 864 480 480 485 501
Modeline "800x600" 43.68 800 816 928 1072 600 600 606 626
Modeline "1024x768" 71.39 1024 1040 1216 1400 768 768 776 802
Modeline "1152x864" 90.48 1152 1168 1384 1568 864 864 873 902
Modeline "1280x960" 111.82 1280 1296 1552 1736 960 960 970 1003
Modeline "1280x1024" 119.28 1280 1296 1552 1736 1024 1024 1035 1070
Modeline "1600x1200" 160.16 1600 1616 1968 2208 1200 1200 1212 1253
Modeline "1600x1200" 167.23 1600 1616 1968 2208 1200 1200 1212 1253
Ubuntu's auto detection appears to be getting these values wrong. I'm
just an amateur though.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Invalid => Incomplete
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IBM A21p display is corrupted
https://bugs.launchpad.net/bugs/28898
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