From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754040Ab0HWVRM (ORCPT ); Mon, 23 Aug 2010 17:17:12 -0400 Received: from tex.lwn.net ([70.33.254.29]:33806 "EHLO vena.lwn.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751948Ab0HWVRK (ORCPT ); Mon, 23 Aug 2010 17:17:10 -0400 Date: Mon, 23 Aug 2010 15:17:08 -0600 From: Jonathan Corbet To: Jonathan Corbet Cc: LKML , dri-devel@lists.freedesktop.org, Chris Wilson , Eric Anholt Subject: Re: [now bisected] i915: 2.6.36-rc2 hoses my Intel display Message-ID: <20100823151708.6b242599@bike.lwn.net> In-Reply-To: <20100823110145.08eb72fd@bike.lwn.net> References: <20100823110145.08eb72fd@bike.lwn.net> Organization: LWN.net X-Mailer: Claws Mail 3.7.6 (GTK+ 2.21.5; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 23 Aug 2010 11:01:45 -0600 Jonathan Corbet wrote: > So I decided to fire up -rc2 today to see what would happen...the > results are best described by the attached images. Something is > clearly scrambled between my hardware and the i915 driver. Display with X > is hosed, but things go weird before X gets a chance to run (it is worth > noting that the initial output from the kernel is legible). I went ahead and bisected the problem, which was added between -rc1 and -rc2. The end result is this: 32aad86fe88e7323d4fc5e9e423abcee0d55a03d is the first bad commit commit 32aad86fe88e7323d4fc5e9e423abcee0d55a03d Author: Chris Wilson Date: Wed Aug 4 13:50:25 2010 +0100 drm/i915/sdvo: Propagate errors from reading/writing control bus. Signed-off-by: Chris Wilson Signed-off-by: Eric Anholt I don't know the driver or the hardware and can't begin to guess what went wrong in that patch, but, hopefully, the information is useful to somebody. Please let me know if there's anything else I can do to help track this down. Thanks, jon From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Corbet Subject: Re: [now bisected] i915: 2.6.36-rc2 hoses my Intel display Date: Mon, 23 Aug 2010 15:17:08 -0600 Message-ID: <20100823151708.6b242599@bike.lwn.net> References: <20100823110145.08eb72fd@bike.lwn.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from vena.lwn.net (tex.lwn.net [70.33.254.29]) by gabe.freedesktop.org (Postfix) with ESMTP id 5BA4A9E7CC for ; Mon, 23 Aug 2010 14:17:10 -0700 (PDT) In-Reply-To: <20100823110145.08eb72fd@bike.lwn.net> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Jonathan Corbet Cc: LKML , dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org On Mon, 23 Aug 2010 11:01:45 -0600 Jonathan Corbet wrote: > So I decided to fire up -rc2 today to see what would happen...the > results are best described by the attached images. Something is > clearly scrambled between my hardware and the i915 driver. Display with X > is hosed, but things go weird before X gets a chance to run (it is worth > noting that the initial output from the kernel is legible). I went ahead and bisected the problem, which was added between -rc1 and -rc2. The end result is this: 32aad86fe88e7323d4fc5e9e423abcee0d55a03d is the first bad commit commit 32aad86fe88e7323d4fc5e9e423abcee0d55a03d Author: Chris Wilson Date: Wed Aug 4 13:50:25 2010 +0100 drm/i915/sdvo: Propagate errors from reading/writing control bus. Signed-off-by: Chris Wilson Signed-off-by: Eric Anholt I don't know the driver or the hardware and can't begin to guess what went wrong in that patch, but, hopefully, the information is useful to somebody. Please let me know if there's anything else I can do to help track this down. Thanks, jon