From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755063AbaE1RZ2 (ORCPT ); Wed, 28 May 2014 13:25:28 -0400 Received: from know-smtprelay-omc-10.server.virginmedia.net ([80.0.253.74]:41703 "EHLO know-smtprelay-omc-10.server.virginmedia.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751550AbaE1RZ0 (ORCPT ); Wed, 28 May 2014 13:25:26 -0400 X-Originating-IP: [81.106.150.188] X-Spam: 0 X-Authority: v=2.1 cv=FZq5xfO6 c=1 sm=1 tr=0 a=DGj713NdaxKrsjjgQne7PA==:117 a=DGj713NdaxKrsjjgQne7PA==:17 a=J0QyKEt1u0cA:10 a=jflk8mYaTLMA:10 a=uObrxnre4hsA:10 a=IkcTkHD0fZMA:10 a=NLZqzBF-AAAA:8 a=ORujRaJQQkipV99H46kA:9 a=QEXdDO2ut3YA:10 Date: Wed, 28 May 2014 18:25:21 +0100 From: Ken Moffat To: Daniel Vetter Cc: Dave Airlie , linux-kernel@vger.kernel.org Subject: Resume from suspend broken in 3.15. (bisected) Message-ID: <20140528172521.GA9945@milliways> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Daniel, I've only started full testing of 3.15 on one of my machines now that -rc7 has been released (this one had two issues in the radeon code, second was fixed in rc7). Unfortunately, suspend to RAM (pm-suspend), or rather the wake-up, is broken on this box [ my other two boxes are fine in rc7 ]. Bisection identified one of your commits - commit 25f397a429dfa43f22c278d0119a60a343aa568f Author: Daniel Vetter Date: Fri Jul 19 18:57:11 2013 +0200 drm/crtc-helper: explicit DPMS on after modeset Atm the crtc helper implementation of set_config has really inconsisten semantics: If just an fb update is good enough, dpms state will be left as-is, but if we do a full modeset we force everything to dpms on. This change has already been applied to the i915 modeset code in ('git show' stops at that point) I have attempted to revert this commit from Linus' current tree, but git considered that there was a conflict, and I did not know how to address it, so I aborted. The conflict is : <<<<<<< HEAD if (connector->dpms != DRM_MODE_DPMS_ON) { DRM_DEBUG_KMS("connector dpms not on, full mode switch\n"); mode_changed = true; } ======= >>>>>>> parent of 25f397a429df... drm/crtc-helper: explicit DPMS on >>>>>>> after modeset break; } } The processor is an AMD A4 APU. The symptoms after this commit are that pm-suspend works (I invoke it from my keyboard's sleep key), i.e. the power LED on the case goes out and the monitor goes black and reports no signal. When I press a key to resume, the power LED comes on but the screen stays black. Magic-SysRQ does not work and I have to use the case switch to reboot. That results in filesystem errors which fsck fixes and warns about (probably, just a sign of unclean shutdown). The only thing in the log are a couple of messages from EXT4 at the end of putting the box to sleep - May 28 16:19:02 bluesbreaker kernel: [ 39.440859] EXT4-fs (sda10): re-mounted. Opts: commit=0 May 28 16:19:02 bluesbreaker kernel: [ 39.592318] EXT4-fs (sda13): re-mounted. Opts: commit=0 May 28 16:20:05 bluesbreaker syslogd 1.5.0: restart. What can I do to help debug this ? ĸen -- Nanny Ogg usually went to bed early. After all, she was an old lady. Sometimes she went to bed as early as 6 a.m.