i've also got this issue with 3.5 and 3.6 kernels on i386 system.
My workaround is via xorg.conf:
create (or replace what's in a current one) an /etc/X11/xorg.conf with
Code:
Section "Device"
Identifier "My Graphics"
Driver "nouveau"
Option "GLXVBlank" "on"
EndSection
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to libdrm in Ubuntu.
https://bugs.launchpad.net/bugs/1039125
Title:
[drm] nouveau 0000:02:00.0: PFIFO_CACHE_ERROR - Ch 2/2 Mthd 0x0800
Data 0x00000000
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libdrm/+bug/1039125/+subscriptions
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