Re: Bug on my VGA driver

[Ben Hutchings <ben@decadent.org.uk>]

On Wed, Jan 25, 2012 at 05:05:33PM +0530, dE . wrote:
> On 01/25/12 18:18, Frank wrote:
> >While I using the computer, the kernel of the system froze. I read the
> >/var/log/kern.log, finding that it might be a problem on VGA.
> >
> >I attached the kern.log. Here's the important part:
> >
> >Jan 25 19:34:24 debian kernel: [ 99.236022] [drm:i915_hangcheck_elapsed]
> >*ERROR* Hangcheck timer elapsed... GPU hung
> >Jan 25 19:34:24 debian kernel: [ 99.236035] [drm] capturing error event;
> >look for more information in /debug/dri/0/i915_error_state
> >Jan 25 19:34:31 debian kernel: [ 106.324022]
> >[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
> >Jan 25 19:34:37 debian kernel: [ 112.148018]
> >[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
> >Jan 25 19:34:37 debian kernel: [ 112.149387] [drm:i915_wait_request]
> >*ERROR* i915_wait_request returns -11 (awaiting 926 at 891, next 927)
> >
> >It might have been a problem of kernel or Xorg.
> >
> >Kernel version: 2.6.39-bpo.2-686-pae
> >Xorg version: 7.6+8~bpo60+1
> >xserver-xorg-video-intel: 2.15.0-3~bpo60+2
> >
> >
> 
> This does not happen with stable kernel/drivers? Sounds like a
> hardware problem.
 
This message doesn't usually indicative a hardware fault.  GPUs
generally don't have any sort of preemptive scheduling.  Instead,
either the hardware or the driver will include a watchdog timer to
terminate GPU programs that take too long.  This kind of error can be
provoked by a bug in libdrm, the X or kernel driver.

Also the i915/intel drivers support a huge number of chips, each with
their own bugs and quirks.  There are very often regressions for one
or other set of chips as a result of an enhancement for some other set
of chips.

Frank, please test the Linux 3.1 or 3.2 package.  I'm not sure whether
the i386 build of 3.2 is available in backports yet, but otherwise you
can get it from unstable.

Ben.

-- 
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
                                                              - Albert Camus