linux-kernel - 2.6.29-rc breaks STD using Intel 945

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Message-Id: <200903042020.57671.eike-kernel@sf-tec.de>
Date:	Wed, 4 Mar 2009 20:20:56 +0100
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	David Airlie <airlied@...ux.ie>, dri-devel@...ts.sourceforge.net
Subject: 2.6.29-rc breaks STD using Intel 945

Hi,

I tested several snapshots post 2.6.28 and all of them show one severe 
problem: resume from disk is not always successful. Only about 50% of the 
resume attempts work, in the other cases I just get a completely black 
screen, can't switch to text console or anything. What I often get is a line 
like this in the logs directly before suspend:

[drm:i915_get_vblank_counter] *ERROR* trying to get vblank count for disabled 
pipe 0

Afterwards I find nothing in the logs. Switching back to 2.6.28 and everything 
works fine again. I have a Toshiba A110-178 running openSuSE 11.1 32 bit with 
KDE 4.2.0. I upgraded my Xserver from 1.5 to 1.6 yesterday but that did not 
change anything. The only external module I use is the omnibook module 
(http://sf.net/projects/omnibook) which I've been using for years without any 
problems.

VGA device is this:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 
943/940GML Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA 
controller])
        Subsystem: Toshiba America Info Systems Device ff01
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at dc100000 (32-bit, non-prefetchable) [size=512K]
        I/O ports at 1800 [size=8]
        Memory at c0000000 (32-bit, prefetchable) [size=256M]
        Memory at dc200000 (32-bit, non-prefetchable) [size=256K]
        Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- 
Count=1/1 Enable-
        Capabilities: [d0] Power Management version 2
        Kernel modules: intelfb

00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML 
Express Integrated Graphics Controller (rev 03)
        Subsystem: Toshiba America Info Systems Device ff01
        Flags: bus master, fast devsel, latency 0
        Memory at dc180000 (32-bit, non-prefetchable) [size=512K]
        Capabilities: [d0] Power Management version 2

If you have any patches you want to try me or have any further questions just 
mail me. If you're hanging around at CeBIT I can come over and we can discuss 
this in person as I'm there for the next days anyway.

Greetings,

Eike

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