panic in drm

[Ronald Klop]

On Thu, 26 Jun 2008 18:01:07 +0200, Gavin Atkinson  
<gavin.atkinson at ury.york.ac.uk> wrote:

> On Thu, 2008-06-26 at 16:09 +0200, Ronald Klop wrote:
>> Hello,
>>
>> At my work I see a panic if I do this.
>> Leaf my computer on screensaver (don't no if that is necessary) and come
>> back the next morning. My monitor is than black, but the light is green,
>> so DPMS didn't kick in.
>> Keys or mouse don't wake up the system. CTRL-ALT-F1 switches to the
>> console and immediately triggers this panic.
>>
>> I'm running latest x.org with xf86-video-i810-1.7.4_1. The newer
>> xf86-video-intel also crashes my system sometimes when I'm working on  
>> it,
>> so a downgraded.
>>
>> Any ideas, suggestions or fixes available?
>
> This sounds very familiar to me.  I think I was seeing the same panic in
> 2006...
> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2006-12/msg00344.html
>
> Can you add this to src/sys/dev/drm/i915_irq.c
>
> if (!dev->irqr) {
>   return DRM_ERR(EINVAL);
> }
>
> just above the DRM_WAIT_ON in i915_driver_vblank_wait() (around line
> 140), and see if that prevents the panic?  Note that I believe this to
> be a workaround, and not really the correct fix.
>
> (sorry for not supplying patches, I'm not in a position to right now)
>
> Gavin

Thanks, I'll try this next week.

Ronald.