[Intel-gfx] Lockup when switching displays using xrandr since kernel 3.5.x

[Daniel Vetter]

On Thu, Oct 18, 2012 at 9:10 AM, Thilo-Alexander Ginkel
<thilo at ginkel.com> wrote:
> On Wed, Oct 17, 2012 at 1:26 AM, Thilo-Alexander Ginkel
> <thilo at ginkel.com> wrote:
>> since upgrading from kernel 3.4.10 to 3.5.x or 3.6.2 (on Kubuntu
>> 12.04) I am getting sporadic (but frequent) lockups when switching
>> displays using xrandr:
>> [...]
>
> BTW, the lockups also happen with i915.i915_enable_rc6=1 (instead of
> the original i915.i915_enable_rc6=3).

Have you upgrade to the very latest xf86-video-intel version already?
We've fixed a few bugs related to modeset changes and hanging the gpu.
Otherwise, make sure that your kernel contains:


commit 5bb61643f6a70d48de9cfe91ad0fee0d618b6816
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Sep 27 21:25:58 2012 +0100

    drm/i915: Flush the pending flips on the CRTC before modification

Yours, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch