[Intel-gfx] display problems since: drm/i915/dp: workaround BIOS eDP bpp clamping issue

[Daniel Vetter]

On Fri, Nov 01, 2013 at 01:29:30PM -0300, Cristian Rodríguez wrote:
> Hi:
> 
> I have a dell laptop XPS 15z, BIOS revision A12, in which a monitor
> is connected to the displayport .. everything was working OK until
> the very latest kernel merge.
> 
> Now, when the monitor is plugged (but NOT when using the laptop
> display) the GPU freezes the screen for a few seconds, it is
> impossible to do anything other than waiting until it recovers.
> 
> reverting commit c6cd2ee2d59111a07cd9199564c9bdcb2d11e5cf
> "drm/i915/dp: workaround BIOS eDP bpp clamping issue gets things
> back to the previous working status.

Can you please boot with drm.debug=0xe added to your kernel cmdline,
reproduce the issue and then attach the complete dmesg?

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