From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932122AbZJBWo2 (ORCPT ); Fri, 2 Oct 2009 18:44:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756608AbZJBWo1 (ORCPT ); Fri, 2 Oct 2009 18:44:27 -0400 Received: from outbound-mail-153.bluehost.com ([67.222.39.33]:40524 "HELO outbound-mail-153.bluehost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1756646AbZJBWoZ (ORCPT ); Fri, 2 Oct 2009 18:44:25 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=virtuousgeek.org; h=Received:Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References:X-Mailer:Mime-Version:Content-Type:Content-Transfer-Encoding:X-Identified-User; b=fUbS1XnK+bGylaCnN5CAx2OpVccxRr7nFx3Yd5y4TdVO++Xw1Lb3ipZMk++9jXPP6+6SWe12DflT9pdCL47kmAQAMMKKlb7TIQAqHlN0VqGfm9doINg3apXIKi1Tsmi+; Date: Fri, 2 Oct 2009 15:44:24 -0700 From: Jesse Barnes To: "Theodore Ts'o" Cc: Eric Anholt , linux-kernel@vger.kernel.org Subject: Re: 2.6.32 regression (bisected): Video tearing/glitching with T400 laptops Message-ID: <20091002154424.331f82a6@jbarnes-g45> In-Reply-To: References: X-Mailer: Claws Mail 3.7.2 (GTK+ 2.17.5; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Identified-User: {10642:box514.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 75.111.28.251 authed with jbarnes@virtuousgeek.org} Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 02 Oct 2009 18:40:27 -0400 "Theodore Ts'o" wrote: > Hi, > > In recent kernels, my X display (running with a KMS-enabled X server) > has been very jittery and with lots of glitching and tearing --- sorry > if this isn't the correct technical term, not sure what it is --- on > my T400 Lenovo laptop. It seems related to what is on the desktop, > and moving the mouse does seem to affect the rate and percentage of > the screen which jitters --- which is enough to be very distracting, > although I can still read the contents of the windows where the screen > is tearing/glitching/flashing. > > I bisected it down to this commit: > > 74dff282237ea8c0a5df1afd8526eac4b6cee063 is the first bad commit > commit 74dff282237ea8c0a5df1afd8526eac4b6cee063 > Author: Jesse Barnes > Date: Mon Sep 14 15:39:40 2009 -0700 > > drm/i915: framebuffer compression for GM45+ > > Add support for framebuffer compression on GM45 and above. > Removes some unnecessary I915_HAS_FBC checks as well (this is now > part of the FBC display function). > > Signed-off-by: Jesse Barnes > Signed-off-by: Eric Anholt > > ... and taking the latest git mainline, and I confirmed that the > problem was still present, and then after reverting this commit, the > problem went away. > > I've included my Xorg.0.log file in case that's helpful. Please let > me know if there's anything else you need. Yeah I've had a couple of other reports of flicker pointing to this commit... I'll be able to look into it next week. -- Jesse Barnes, Intel Open Source Technology Center