Ferry:
It's really hard to tell and there's a risk that a lot of issues that might be 
need to be separate are lumped together.

I've seen different types of corruption on my EeePC 900 with an 915GM since 
10.10:
Horizontal line(s) through a glyph. Affects the same character of that 
font/size repeatedly, problem persists past a repaint. Screenshot: 
https://bugs.freedesktop.org/attachment.cgi?id=45730
A rectangular/square "block" of the glyph is missing. Affects the same 
character of that font/size repeatedly, problem persists past a repaint. 
Probably the same as the above but might be different. Tends to be rarer than 
the first type of corruption.

The 945GM I have never shows the above problems (although it shows
another issue - https://bugzilla.redhat.com/attachment.cgi?id=493733 ).
I've also yet to see any font corruption on a machine with a 965G
graphics chipset...

All the corruption above happens without needing to suspend/hibernate
and resume.

We need to be clear on what types of corruption happen, where they
happen, what triggers the corruption and which graphics card chipset is
being used. Another thing to check is whether turning off tiling by
putting

Section "Device"
    Identifier      "Intel"
    Driver        "intel"
    Option         "Tiling" "false"
EndSection

in /etc/X11/xorg.conf and then rebooting changes whether the corruption
appears (the above is purely for testing purposes though - don't run
daily with such a configuration as it will be very slow!).

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

Title:
  [915GM] font corruption on Intel GMA900

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