linux-kernel - Regression DRM/i915/KMS: VGA connector unusable after 2.6.31-rc8-git1, DVI connector ok

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Date:	Wed, 09 Sep 2009 00:19:04 +0200
From:	Knut Petersen <Knut_Petersen@...nline.de>
To:	Linus Torvalds <torvalds@...l.org>
CC:	airlied@...ux.ie, linux-kernel@...r.kernel.org
Subject: Regression DRM/i915/KMS: VGA connector unusable after 2.6.31-rc8-git1,
 DVI connector ok

Hi everybody!

During the release cycle of the 2.6.31-rc* kernels KMS started to work
on my computer.

Booting with a monitor attached to both the VAG and the DVI connectors,
kernel 2.6.31-rc8-git1
detects both monitors correctly and sets the native video mode.

Booting the same configuration with kernel 2.6.31-rc8-git2 ... -rc9-git1
gives a different result:
the DVI-attached monitor is still working perfectly, the VGA-attached
monitor does not detect a
valid video signal and switches off.

Hardware: AOpen i915GMm-hfs,  Pentium-M 1.86 MHz,  2GB RAM
The Aopen i915GMm-hfs is a  desktop board with a mobile Chipset:

00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML
Express Processor to DRAM Controller (rev 04)
00:02.0 VGA compatible controller: Intel Corporation Mobile
915GM/GMS/910GML Express Graphics Controller (rev 04)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML
Express Graphics Controller (rev 04)

Config: AGP/DRM/I915 all compiled into kernel, KMS enabled.

Log_Broken contains the result of "cat boot.msg | grep -i drm" of a boot
with 2.6.31-rc8-git2,
Log_OK contains the result of "cat boot.msg | grep -i drm" of a boot
with 2.6.31-rc8-git1

As a black monitor is not a nice gift I think this should be fixed
before the final release of 2.6.31.

cu,
 Knut

View attachment "LOG_BROKEN" of type "text/plain" (13704 bytes)

View attachment "LOG_OK" of type "text/plain" (15899 bytes)