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Date: Mon, 12 Mar 2007 22:19:52 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>, Greg KH <greg@kroah.com>
Cc: "bugme-daemon@kernel-bugs.osdl.org" 
	<bugme-daemon@bugzilla.kernel.org>,
       linux-kernel@vger.kernel.org, ktk@bigfoot.com
Subject: Re: [Bugme-new] [Bug 8187] New: 2.6.20 "PCI: Quirks" patch breaks
 X11 on I82801
Message-Id: <20070312221952.691adeea.akpm@linux-foundation.org>
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> On Mon, 12 Mar 2007 13:30:05 -0700 bugme-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=8187
> 
>            Summary: 2.6.20 "PCI: Quirks" patch breaks X11 on I82801
>     Kernel Version: 2.6.20
>             Status: NEW
>           Severity: normal
>              Owner: greg@kroah.com
>          Submitter: ktk@bigfoot.com
> 
> 
> Most recent kernel where this bug did *NOT* occur:
> Any 2.6.20-pre prior to commit 368c73d4f689dae0807d0a2aa74c61fd2b9b075f
> 
> Distribution:  Slackware 11.0
> Hardware Environment:  HP/Compaq dc5000S (P4, 82801, 82865)
> Software Environment:  Xorg 6.9.0
> Problem Description:
> 
> Alan Cox introduced a "PCI: Quirks" patch (git commit
> 368c73d4f689dae0807d0a2aa74c61fd2b9b075f) in 2.6.20 that breaks X11 on this
> I82801 platform.  Specifically, it causes the PCI initialisation to become
> buggered; Xorg 6.9.0 dumps the following to the console:
> 	(EE) end of block range 0x177 < begin 0x3f0
> 	(EE) end of block range 0x177 < begin 0x3f0
> 	(WW) ****INVALID IO ALLOCATION**** b: 0x14d0 e: 0x14d7 correcting
> [...]
> 	Backtrace:
> 	0: X(xf86SigHandler+0x8a) [0x8088b2a]
> 	1: [0xb7f2b420]
> 	2: /usr/X11R6/lib/modules/drivers/i810_drv.so [0xb797f592]
> 	3: X(InitOutput+0xb83) [0x8072713]
> 	4: X(main+0x226) [0x80d4496]
> 	5: /lib/tls/libc.so.6(__libc_start_main+0xd4) [0xb7da7e14]
> 	6: X [0x806ff61]
> 
> 	Fatal server error:
> 	Caught signal 11.  Server aborting
> 
> Steps to reproduce:
> 
> Reverting the git commit mentioned above fixes the issue.  Apparently, this may
> be limited to certain combinations of on-motherboard chipsets, as I haven't seen
> many bug reports.  Googling shows some people having X11 segfault issues with
> 2.6.20 (e.g. freedesktop.org bug #9956) but in most of those cases it's due to
> the evdev driver and not PCI initialisation.
> 
> I wrote to Alan (cc'ed Greg as he signed off on the patch) nearly two weeks ago
> but have heard nothing, so I'm leaving a bug here instead.
> 

argh.

Would we break more machines than we fix if we just revert that?