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

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Date:	Wed, 20 Feb 2013 21:19:01 +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
Subject: Re: i915 black screen introduced by ACPI changes

On Wed, Feb 20, 2013 at 8:45 PM, Chris Li <lkml@...isli.org> wrote:
> On Wed, Feb 20, 2013 at 2:57 AM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
>
>> Starts to smell like a bog-standard i915 black screen bug (albeit with
>> a strange cause for the regression). Can you please boot the broken
>> kernels again with drm.debug=0xe and grab the complete dmesg?
>> Depending upon how long it takes for your wifi to get up, you might
>> need to extend the log buffer, it dumps a lot.
>
> Here is the dmesg with "drm.debug=0xe". It is from the tip of git
> kernel. The computer has the black screen.
> Let me know what else do you need.

The debug option did not stick for some reason. Also you're hitting a
bunch of WARNs in our driver self-checks. Iirc those should be fixed
in the latest code. Can you please test with the latest
drm-intel-nightly branch from

http://cgit.freedesktop.org/~danvet/drm-intel

Also can you please attach a dmesg from a working kernel without the
i915.modeset=0 option?

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