From mboxrd@z Thu Jan 1 00:00:00 1970 From: Theodore Ts'o Subject: [REGRESSION] i915: failure to see Dell 30" monitor connected to a Lenovo Haswell docking station Date: Tue, 2 Sep 2014 00:05:27 -0400 Message-ID: <20140902040527.GA5508@thunk.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: Daniel Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jani Nikula List-Id: dri-devel@lists.freedesktop.org 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