(In reply to comment #81)
> and applied the following patch on top of it.
> 
>     commit f49c3cacd25ffb78ccfff49b001ba89375044145
>     Author: Chris Wilson <[email protected]>
>     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

Status in X.org xf86-video-intel:
  Confirmed
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Triaged
Status in “xserver-xorg-video-intel” package in Debian:
  Confirmed

Bug description:
  Sometimes getting incomplete drawing of same glyphs of one font on
  whole screen.

  In the screenshot you can see the "e" is drawn incompletely (both
  english and cyrillic too).

  The bug is happening frequently and spontaneous on my Asus EEEPC 900.

  (This issue affects Ubuntu's 10.10 or later. A workaround using the
  DebugWait parameter is described in comment #40 -
  https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
  intel/+bug/745608/comments/40 ).

  [lspci]
  Nux: lspci: 00:02.0 VGA compatible controller [0300]: Intel Corporation 
Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 04)

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