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[adamvert <adam@xxxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-ati

Ubuntu 9.04, on a Lenovo Thinkpad Z61m

xserver-xorg-video-ati 1:6.12.1-0ubuntu2

Text becomes corrupted after an arbitrary period of usage, usually
several hours.  See attached screenshots for examples.  The corruption
can be fixed by forcing the text to be re-rendered (e.g. by changing the
zoom level in Firefox).  Corruption is always associated with a
particular character (e.g. all instances of upper case 'W').

Trying different AGPMode values
(https://wiki.ubuntu.com/X/Quirks#ATI%20AGP%20Mode%20Quirk) has no
effect.

Setting AccelMethod to 'XAA' does seem to fix it, but makes the system
so slow as to be unusable (hard to tell whether this really does fix it,
since the corruption only sporadically appears).

Attached below are example screenshots of the problem in Firefox; and in
Eclipse, the Gnome panel and a tooltip.

[lspci -vvn]
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon Mobility X1400 [1002:7145]
	Subsystem: Lenovo Device [17aa:202a]
	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, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at d8000000 (32-bit, prefetchable) [size=128M]
	Region 1: I/O ports at 2000 [size=256]
	Region 2: Memory at ee000000 (32-bit, non-prefetchable) [size=64K]
	[virtual] Expansion ROM at ee020000 [disabled] [size=128K]
	Capabilities: <access denied>

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: New

-- 
Arbitrary text corruption with Radeon X1400 
https://bugs.launchpad.net/bugs/418625
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