Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754078Ab2JFIYp (ORCPT ); Sat, 6 Oct 2012 04:24:45 -0400 Received: from mga14.intel.com ([143.182.124.37]:11713 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753785Ab2JFIYl (ORCPT ); Sat, 6 Oct 2012 04:24:41 -0400 Message-Id: <051c15$4i14fm@AZSMGA002.ch.intel.com> X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,543,1344236400"; d="scan'208";a="153129462" From: Chris Wilson Subject: Re: 3.5 regression on i915 To: Willy Tarreau , Dave Airlie Cc: Daniel Vetter , linux-kernel@vger.kernel.org In-Reply-To: <20121006075956.GF21163@1wt.eu> References: <20121005234218.GC21163@1wt.eu> <20121005235845.GE21163@1wt.eu> <20121006072704.GA22465@1wt.eu> <20121006075956.GF21163@1wt.eu> Date: Sat, 06 Oct 2012 09:24:35 +0100 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2109 Lines: 48 On Sat, 6 Oct 2012 09:59:56 +0200, Willy Tarreau wrote: > On Sat, Oct 06, 2012 at 03:43:56AM -0400, Dave Airlie wrote: > > On Sat, Oct 6, 2012 at 3:27 AM, Willy Tarreau wrote: > > > On Sat, Oct 06, 2012 at 01:58:45AM +0200, Willy Tarreau wrote: > > >> On Sat, Oct 06, 2012 at 09:48:57AM +1000, Dave Airlie wrote: > > >> > Any reason you don't have KMS, you'll keep hitting these non-kms bugs > > >> > since it has no users anymore really. > > >> > > > >> > Granted they'll get fixed, but I suspect its a losing battle over time. > > >> > > >> Well, back in old times every time I tried to enable it, I only ran into > > >> problems so I got used to disable it, which made sense since it didn't > > >> bring me any benefit. > > > > > > OK I found why in the end. When I enable KMS, my X server fails to start > > > and segfaults in intel_drv.so. So I think that the comment in Kconfig > > > below is quite appropriate : > > > > Okay are you running a really old userspace? just wondering what could > > cause this. > > yes, my Xorg is 1.4.2 and xf86-video-intel is 2.7.1. > > I have additional information, I retested with 3.4.12 with and without KMS : > > 3.4.12, no KMS : X works fine > 3.4.12, KMS : X works fine but some garbage follows the mouse pointer > on the external display > 3.5.x no KMS : kernel BUG > 3.5.x KMS : X server segfaults in intel driver > > So in fact, both the KMS/non-KMS confs have regressed in 3.5 on this setup. > > It is possible that the commit which removed the list of pinned inactive > objects (1b50247a) has uncovered another long-time bug. More likely X is segfaulting for another reason altogether. Can you please attach the stacktrace (with symbols!) and see if another bisection is required? -Chris -- Chris Wilson, Intel Open Source Technology Centre -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/