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Date: Thu, 22 Nov 2012 21:32:42 +0100
Message-ID: <CAKMK7uH1=vA7YCh9eZSyW=ewF3kYkdgT45LhYqnigPg0whe5aA@mail.gmail.com>
Subject: Re: Linux 3.7-rc6
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Henrik Rydberg <rydberg@euromail.se>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Henrik Rydberg <rydberg@bitmath.se>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org
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On Thu, Nov 22, 2012 at 7:23 PM, Henrik Rydberg <rydberg@euromail.se> wrote:
>> >> My apologies for the long delay in answering, I've somehow mixed up
>> >> different bugreports and thought I've sent you a patch to test
>> >> already. Anyway, please test
>> >>
>> >> https://patchwork.kernel.org/patch/1728111/
>> >
>> >     Tested-by: Henrik Rydberg <rydberg@euromail.se>
>>
>> Can you please boot with drm.debug=0xe added to your kernel cmdline
>> with that patch applied and attach the full dmesg?
>
> Are you looking for something in particular? The patch obviously works
> because edp_bpp is never set. The reason seems to be
>
> [    1.634759] [drm:intel_parse_bios], VBT signature missing
>
> In the source, a few lines above that message, we have something that
> looks suspciciously like an off-by-one error:
>
>         /* Scour memory looking for the VBT signature */
>         for (i = 0; i + 4 < size; i++) {
>
> If that matters or not, I do not know. Any more tests would have to
> wait until tomorrow.

Yeah, the utter lack of a vbt fits very nicely, thanks for checking,
I've merged the patch into drm-intel-fixes and will forward it for
inclusion into 3.7 rsn.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch