linux-kernel - [REGRESSION] i915: failure to see Dell 30" monitor connected to a Lenovo Haswell docking station

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Date:	Tue, 2 Sep 2014 00:05:27 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Jani Nikula <jani.nikula@...el.com>
Subject: [REGRESSION] i915: failure to see Dell 30" monitor connected to a
 Lenovo Haswell docking station

I recently upgraded to v3.17-rc3, and on my Lenovo T540p, I can no
longer see the my Dell 30" monitor when it is connected via the
docking station using a Displayport connector.  This worked using 3.16
kernel.

If I connect to the monitor using the mini-display, by passing the
docking station, things work fine (but of course it's annoying not to
be able to use the docking station).

Is this a known problem?  This is not the first time that we've had
regressions with this docking station.   It's vaguely reminsicent of 

	https://bugs.freedesktop.org/show_bug.cgi?id=71267

Except the system isn't hanging; it's just not seeing the monitor at all.

Thanks,

					- Ted

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