From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752210AbcF1PQe (ORCPT ); Tue, 28 Jun 2016 11:16:34 -0400 Received: from datenkhaos.de ([81.89.99.198]:48674 "EHLO mail.datenkhaos.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751419AbcF1PQc (ORCPT ); Tue, 28 Jun 2016 11:16:32 -0400 X-Greylist: delayed 580 seconds by postgrey-1.27 at vger.kernel.org; Tue, 28 Jun 2016 11:16:32 EDT Date: Tue, 28 Jun 2016 17:06:44 +0200 From: Johannes Hirte To: Maarten Lankhorst , LKML Subject: "drm/core: Do not preserve framebuffer on rmfb prevends display" breaks display resume after dpms suspend Message-ID: <20160628150644.GA3210@probook> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.6.1 (2016-04-27) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On my system the display doesn't come back after a dpms suspend with X11. The display is powered off after the configured time, but to get it powered on I need to switch to console (and back to X). It doesn't happen on simple keyboard or mouse input. Also the brightness is on the lowest level, independently what adjustment it was before suspend. Bisecting pointed me to this commit: f2d580b9a8149735cbc4b59c4a8df60173658140 drm/core: Do not preserve framebuffer on rmfb, v4. and reverting it solves the problem for me. System is ProBook 6450b from HP with integrated Intel graphics (Ironlake). The xf86-video-intel driver is configured with UXA acceleration. regards, Johannes