linux-kernel - Re: i915 black screen introduced by ACPI changes

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Date:	Mon, 4 Mar 2013 15:16:20 -0800
From:	Chris Li <lkml@...isli.org>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org, robert.moore@...el.com,
	feng.tang@...el.com, len.brown@...el.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: i915 black screen introduced by ACPI changes

Thanks Daniel

I am recompiling the kernel.
I will also open a bug in bugzilla when I collect all the relative information.


Chris

On Mon, Mar 4, 2013 at 9:50 AM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
>> Two things to test:
>> - Can you please check whether any of the backlight drivers in
>> /sys/class/backlight does anything? You need to frob the brightness
>> file. Please also list all the drivers you have.

 This is the good one before
the acpi change.

lrwxrwxrwx. 1 root root 0 Mar  4 15:05 acpi_video0 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0
lrwxrwxrwx. 1 root root 0 Mar  4 15:05 acpi_video1 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video1
lrwxrwxrwx. 1 root root 0 Mar  4 15:05 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight

The brightness,actual_brightness and max_brightness are all
4648.


>> - Please grab the lates git of intel-gpu-tools and attach the output
>> of intel_reg_dumper for both a working and a broken kernel. The git
>> tree is at:

I attach the reg dump file here.

Thanks

Chris

Download attachment "intel-reg-dump.good" of type "application/octet-stream" (14955 bytes)