linux-kernel - Re: Xorg crash at first start

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Date:	Sun, 14 Dec 2008 09:14:23 +1000
From:	"Dave Airlie" <airlied@...il.com>
To:	"Cédric Godin" <cedric@...bone.be>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: Xorg crash at first start

On Mon, Dec 8, 2008 at 8:23 PM, Cédric Godin <cedric@...bone.be> wrote:
> Dave Airlie wrote:
>> On Fri, Dec 5, 2008 at 9:48 PM, Cédric Godin <cedric@...bone.be> wrote:
>>
>>> Dave Airlie wrote:
>>>
>>>> On Fri, Dec 5, 2008 at 12:26 AM, Cédric Godin <cedric@...bone.be> wrote:
>>>>
>>>>
>>>>> Hello,
>>>>>
>>>>> With the v2.6.28-rc7-105-gfeaf384 kernel, when booting my compaq with
>>>>> attached config, the screen switches in graphical mode but then switches
>>>>> back in textual mode with an 'irq10 nobody cared' error in dmesg (attached).
>>>>>
>>>>> If I restart kdm by hand, all is ok (i have my kdm) but the error yet
>>>>> appears in dmesg (at each X start in fact).
>>>>>
>>>>> I bisected the problem (git bisect log attached) and found the following
>>>>> commit as "culprit" :
>>>>>
>>>>> commit 52440211dcdc52c0b757f8b34d122e11b12cdd50
>>>>> Author: Keith Packard <keithp@...thp.com>
>>>>> Date:   Tue Nov 18 09:30:25 2008 -0800
>>>>>
>>>>>    drm: move drm vblank initialization/cleanup to driver load/unload
>>>>>
>>>>>    drm vblank initialization keeps track of the changes in driver-supplied
>>>>>    frame counts across vt switch and mode setting, but only if you let
>>>>> it by
>>>>>    not tearing down the drm vblank structure.
>>>>>
>>>>>    Signed-off-by: Keith Packard <keithp@...thp.com>
>>>>>    Signed-off-by: Dave Airlie <airlied@...hat.com>
>>>>>
>>>>> Reverting it brings back my X screen at first start.
>>>>>
>>>>>
>>>> Just for testing, can you try without using vesafb....
>>>>
>>>> so remove the vga= line from the commandline or build the kernel
>>>> without vesafb support.
>>>>
>>>>
>>> I can confirm the problem without vesafb
>>>
>>
>> Can you boot to a runlevel with no X running
>> do
>> modprobe drm debug=1
>> or if drm is loaded
>> echo 1 > /sys/module/drm/parameters/debug
>> and then start X
>>
>> and attach the dmesg here.
>>
>> I've some ideas but no concrete reason for what might be going wrong.
>>
>> Dave.
>>
>
> First sorry for late answer.
> Here is the dmesg asked in attach (modprobe + startx).
> Hope it helps.
>

Can you check out latest Linus git and retry this.

Dave.
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