Bug#670714: xserver-xorg-video-intel: [i945GME] Screen corruption after using GL programs
Package: xserver-xorg-video-intel
Version: 2:2.18.0-2
Severity: normal
Dear Maintainer,
I am currently running Debian/sid and using version 2:2.18.0-2 of the Intel
video driver. The system is an EeePC 1008HA with a 945GME chipset and a
display resolution of 1024x600. This is a 32bit machine with an Intel Atom
CPU and 2 GB of RAM.
I have X configured to use xscreensaver and have the GL hacks installed.
When a GL hack runs, the hack itself looks just fine, but upon exiting I will
now have severe display corruption in X.
I am using gnome-shell (version 3.2.2.1-3) so I know it is also using GL to
show most of its display. The corruption takes the form of windows not having
the correct contents, showing portions of other windows, some blockiness and
flickering. If I activate gnome-shell's hot-corner in the upper-left to get
the application list and display of running programs, the corruption on that
screen is very heavy. It's hard to read anything and the background is
entirely distorted.
When this problem occurs there are no new messages in the kernel log nor in
the Xorg.0.log file. As far as the kernel and X are concerned, nothing
unusual seems to have occurred. The rest of the Xorg log file is just
standard auto-detect messages. There are no warnings or errors.
I can make the situation slightly better by repeatedly Alt-TABing from window
to window. If my terminal window is distorted, for example, I Alt-TAB in a
complete cycle back to the terminal window. This redraw doesn't always fix
it, but if I do this several times in a row I can get a usable and viewable
window back again. Simply clicking on another window to bring it to the
foreground does not seem to work as well, but that could just be my limited
testing.
Switching to the console and back to X does not fix the problem. Logging out
of X and logging back in, which causes X to restart, does fix the problem.
I don't know why the GL hack itself displays fine but the rest is distorted.
Perhaps this could mean that gnome-shell is at fault here and not the Intel
video driver? I'm running gnome-shell on other Debian/sid machines, but they
are using different Xorg video drivers.
Until about two weeks ago, I was using Ubuntu 11.10 on this machine, running
whichever versions of gnome-shell and xserver-xorg-video-intel it shipped
with. I did not have any display corruption issues with that setup.
In the meantime, I have turned off xscreensaver so that the GL hacks won't
corrupt the screen. I do not, at present, have any other fullscreen GL or
GL-heavy programs installed to see if they also cause gnome-shell/X to flake
out.
I apoligize for the lack of boilerplate system configuration information. The
netbook with the problem is not (yet) configured to send out email so I have
run reportbug on another Debian machine.
--
--John Gruenenfelder Systems Manager, MKS Imaging Technology, LLC.
Try Weasel Reader for PalmOS -- http://weaselreader.org
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