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Date:	Mon, 1 Sep 2014 23:13:44 +0100
From:	Damien Lespiau <>
To:	Alan Stern <>
Cc:	Daniel Vetter <>,
	intel-gfx <>,
	Kernel development list <>
Subject: Re: [Intel-gfx] Regression in drm-intel caused by d91a2cb8e510

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


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