Dave Airlie wrote:
> On Fri, Dec 5, 2008 at 9:48 PM, Cédric Godin <cedric@belbone.be> wrote:
>   
>> Dave Airlie wrote:
>>     
>>> On Fri, Dec 5, 2008 at 12:26 AM, Cédric Godin <cedric@belbone.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@keithp.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@keithp.com>
>>>>    Signed-off-by: Dave Airlie <airlied@redhat.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.

Cedric