I have this problem on my thinkpad x30--
00:02.0 VGA compatible controller [0300]: Intel Corporation 82830 CGC [Chipset 
Graphics Controller] [8086:3577] (rev 04)
00:02.1 Display controller [0380]: Intel Corporation 82830 CGC [Chipset 
Graphics Controller] [8086:3577]

The same font corruption and lines of text randomly disappear.  There
are other rendering bugs also.

I have tried upgrading to kernel 2.6.30 and 2.6.31-rc3 from ~kernel-ppa to no 
avail.  Unless there is some other change in Karmic, perhaps to the X server, 
which might fix the problem it does not appear as if this is the fix.
I am seeing this in KDE and saw it in compiz, but compiz no longer loads.  
Acceleration is set to uxa and tiling is set to off in xorg.conf which seems to 
help slightly.

-- 
fonts corrupts after a while
https://bugs.launchpad.net/bugs/326487
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