I have found articles in the AMD (ATI) knowledge base regarding similar
problems:
737-23189: FireGL X3-256 : Corrupted display with SAMSUNG SyncMaster 305Ton
2560x1600 through Dual Link DVI port
https://support.ati.com/ics/support/KBAnswer.asp?questionID=23189
Quad Buffer Stereo causes 2D graphics corruption in XFree86
https://support.ati.com/ics/support/KBAnswer.asp?questionID=219
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[fglrx] Scrambled mouse pointer and parts of screen in big desktop mode
https://bugs.launchpad.net/bugs/106148
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Bugs, which is the bug contact for Ubuntu.
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