On Mon, 1 Sep 2014, Damien Lespiau wrote: > On Mon, Sep 01, 2014 at 04:19:23PM -0400, Alan Stern wrote: > > Daniel: > > > > I'm encountering a problem with the drm-intel-nightly branch in your > > drm-intel repository. The symptom is that when I boot my laptop, at > > some point during the start-up procedure the screen goes totally blank, > > as though the backlight were turned off, and it remains that way. I > > can't tell if the backlight really is off -- it may be that there's > > just nothing being displayed -- and playing with the screen-brightness > > function keys doesn't help. > > > > Git bisect located the source of the problem as commit d91a2cb8e510 > > (drm/i915: Add 180 degree primary plane rotation support). The problem > > occurs when I boot a kernel built from that commit, and it doesn't > > occur when I boot a kernel built from the preceding commit > > (19ac737dc3c3). > > > > If necessary, I can get debugging info by logging in over a network > > connection. Tell me what you need. > > It seems like Ville and Mika already caught a similar bug today, could > you give Ville's patch a go (available on the intel-gfx): > > drm/i915: Don't call intel_plane_restore() when the prop value didn't change Yes, that patch fixed the problem. Thank you. Tested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Alan Stern _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
