Hi,
Linux v2.6.32-rc1 introduced a bug for me, which gives me a black screen
on my laptop when booting with KMS switched on. Starting X does not
change that, i.e. I don't get any graphics to see. Except for this, the
system runs fine, and the backlight of the LCD display is on. If I
switch KMS off, the system runs perfectly.
I reported this problem before, but did not get any response. In the
meantime, I used git-bisect to find the responsible commit:
commit e70236a8d3d0a4c100a0b9f7d394d9bda9c56aca
Author: Jesse Barnes <jbar...@virtuousgeek.org>
Date: Mon Sep 21 10:42:27 2009 -0700
drm/i915: split display functions by chip type
This patch splits out several of the display functions into a separate
display function table to avoid tons of chipset specific if..else
if..else if blocks all over. There are more opportunities for this
(some noted in the structure defintition); so more cleanup patches will
follow.
Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org>
Signed-off-by: Eric Anholt <e...@anholt.net>
Double-checked that by unapplying the commit (KMS works), and reapplying
it (KMS does not work).
Kernels up to 2.6.34-rc1 do not solve the problem for me, and
unfortunately, unapplying the patch to v2.6.32 or 2.6.33 results in
conflicts. Framebuffer console and KMS on 2.6.31 worked fine, only X did
not cooperate with that.
Any help appreciated, and I will do my best to answer any questions.
Running on Debian testing.
lspci -v:
00:02.0 VGA compatible controller: Intel Corporation 82830 CGC [Chipset
Graphics Controller] (rev 04) (prog-if 00 [VGA controller])
Subsystem: Samsung Electronics Co Ltd Device c002
Flags: bus master, fast devsel, latency 0, IRQ 10
Memory at e8000000 (32-bit, prefetchable) [size=128M]
Memory at e0000000 (32-bit, non-prefetchable) [size=512K]
Expansion ROM at <unassigned> [disabled]
Capabilities: [d0] Power Management version 1
00:02.1 Display controller: Intel Corporation 82830 CGC [Chipset
Graphics Controller]
Subsystem: Samsung Electronics Co Ltd Device c002
Flags: bus master, fast devsel, latency 0
Memory at f0000000 (32-bit, prefetchable) [size=128M]
Memory at e0080000 (32-bit, non-prefetchable) [size=512K]
Capabilities: [d0] Power Management version 1
Thanks,
Martin
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