linux-kernel - Regression in drm-intel caused by d91a2cb8e510

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Date:	Mon, 1 Sep 2014 16:19:23 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Daniel Vetter <daniel@...ll.ch>
cc:	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Regression in drm-intel caused by d91a2cb8e510

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.

Alan Stern

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