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

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Message-ID: <CAKMK7uEc5R8WrdDaQWQPG-0L+uEFc_5idkvwKm2vvLDeOGQ3tA@mail.gmail.com>
Date:	Mon, 4 Mar 2013 18:50:13 +0100
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	Chris Li <lkml@...isli.org>
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

Meh, forgotten to actually cc more lists ...
-Daniel

On Mon, Mar 4, 2013 at 6:49 PM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> On Mon, Mar 4, 2013 at 6:11 PM, Chris Li <lkml@...isli.org> wrote:
>> To recap, the black screen first show up after the ACPI change to use widows 8
>> string. The i915_setmode function did not crash. The printk output
>> from that function seems the same as the one that is in 3.6 kernel.
>> I also include the 3.6 and 3.7 kernel dmesg. The black screen is 100%
>> reproducible.
>>
>> Any suggestion how to further debug this i9515 black screen problem?
>> I really want to get it fixed.
>
> Sorry for missing out on this one, I'll add a few more mailing lists to.
>
> Backlight issues themselves are usually a pain. I've looked through
> your debug dmesg and there doesn't seem to be anything bad going on.
>
> 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.
> - 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:
>
> http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/
>
> Since backlight bugs usually take a lot of poking to figure out it
> might be good to keep things together in a bugzilla report.
> bugs.freedesktop.org, DRI -> DRM (Intel) is the preferred location,
> please file a report there and attach the dump files (and the debug
> dmesg logs we've gathered already).
>
> Thanks, Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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