From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751049AbaIBEFc (ORCPT ); Tue, 2 Sep 2014 00:05:32 -0400 Received: from imap.thunk.org ([74.207.234.97]:60106 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750948AbaIBEFb (ORCPT ); Tue, 2 Sep 2014 00:05:31 -0400 Date: Tue, 2 Sep 2014 00:05:27 -0400 From: "Theodore Ts'o" To: Daniel Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jani Nikula Subject: [REGRESSION] i915: failure to see Dell 30" monitor connected to a Lenovo Haswell docking station Message-ID: <20140902040527.GA5508@thunk.org> Mail-Followup-To: Theodore Ts'o , Daniel Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jani Nikula MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.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