ubuntu-x-swat team mailing list archive

["sergio.callegari" <sergio.callegari@xxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

On machines where lspci reports Display controller: Intel Corporation
Mobile 4 Series Chipset Integrated Graphics Controller (rev 07) and the
xorg log a GM45 chipset, page flipping is broken with current
DRM/xorg/intel drivers as well as with updated combinations of the above
up to kernel 2.6.38, xorg 1.9, intel driver 2.14.

Sympthoms include severe display corruption whenever compositing is on
and a full screen accelerated application is started and then stopped
(screensaver, impress presentation, youtube full screen video, etc.).
Under kde, sympthoms also include kwin crashes.

The bug is nasty, since recovery is possible only by disabling and re-
enabling compositing, a non obvious operation, that the unexperienced
user will not instinctively try, resorting to a reboot (with possible
data loss).

Disabling page flipping makes xorg a bit slower but resolves the issue.

As long as the root cause of the problem is not identified and fixed,
IMHO page-flipping should be disabled on this hardware.

See also https://bugs.freedesktop.org/show_bug.cgi?id=32303

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in ubuntu.
https://bugs.launchpad.net/bugs/737602

Title:
  page flipping needs to be disabled (for now) on GM45 chipset