[Bug 55500] [sna gen4] corrupt rendering (and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

Alexander <alex.haeussler at googlemail.com> changed:

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                 CC|                            |alex.haeussler at googlemail.c
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--- Comment #113 from Alexander <alex.haeussler at googlemail.com> ---
I'm also affected by this character corruption bug. My hardware is a notebook
with Intel 4500M (i915 driver). First I thought it's caused by a hardware issue
with my external screen, but the notebook screen shows the currupted characters
as well. Sometimes when I scroll down to the end of a website with text and
then keep scrolling (when the end is reached), about 2 characters per sentence
are corrupted and about every 1/10 second the position of the curruptions
change. The characters that were corrupted before look fine then and different
characters are corrupted.

What I have tried so far:

- Disable/enable xcompmgr (no effect)
- Use XFCE (no effect)
- Change driver options i915_enable_rc6, i915_enable_fbc, lvds_downclock (no
effect)
- Use different fonts (no effect)
- Disable sna (works)
- Test firefox, libreoffice, chromium (all affected)

Version Info:

Kernel 3.10.1-1-ARCH
xf86-video-intel 2.21.12

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