I was having the same problem on my Thinkpad X30, see attached
screenshot. It's obvious that it's not just the fonts that are affected
(see eg the progress bars in the system monitor in the top panel).
Setting the Option "AccelMethod" "XAA" as suggested in the initial bug
report seems to have solved the issue.
This is on xubuntu, updated from hardy which was updated from gutsy.
from lspci:
00:02.1 Display controller [0380]: Intel Corporation 82830 CGC [Chipset
Graphics Controller] [8086:3577]
Subsystem: IBM Device [1014:0513]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0 (2750ns max)
Region 0: Memory at e8000000 (32-bit, prefetchable) [size=128M]
Region 1: Memory at d0080000 (32-bit, non-prefetchable) [size=512K]
Capabilities: [d0] Power Management version 1
Flags: PMEClk- DSI+ D1+ D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
I don't have an Xorg.0.log from when the problem occurred.
** Attachment added: "Screenshot.png"
http://launchpadlibrarian.net/19606727/Screenshot.png
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[i830] font drawing corruption regression ubuntu intrepid
https://bugs.launchpad.net/bugs/293059
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