(In reply to comment #81)
> and applied the following patch on top of it.
> 
>     commit f49c3cacd25ffb78ccfff49b001ba89375044145
>     Author: Chris Wilson <ch...@chris-wilson.co.uk>
>     Date:   Thu Jan 10 19:14:21 2013 +0000
> 
>         intel: Throttle harder
> 
> Limited testing shows that the glyph corruption is gone. Unfortunately
> performance seems to be slower too. That means for example maximizing a
> window it does not happen instantly and I can see how it is redrawn. So
> basically the same behavior with `"DebugWait" "true"`, if I remember
> correctly.

What I realised later was that Sitosfe was hitting the bug in libdrm-
intel that was causing it to fallback to swrast. After applying that
patch, you also need libdrm-intel-2.4.41 or just
http://cgit.freedesktop.org/mesa/drm/commit/?id=fdda97007b1dbf95beb16a0e3510fd36c89e8c33

Paul, can you update libdrm and see if the bug returns?

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https://bugs.launchpad.net/bugs/745608

Title:
  [915GM] font corruption on Intel GMA900

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