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.

If you need more infos, ask.

Cedric