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SubjectRe: [2.6.39] drm/i915: blank screen on Lenovo Ideapad U160
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Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> writes:

> Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> writes:
>
>> "Robert P. J. Day" <rpjday@crashcourse.ca> writes:
>>
>>> On Tue, 31 May 2011, Dirk Gouders wrote:
>>>
>>>> Hello,
>>>>
>>>> I tested 3.0.0-rc1 on my notebook which has never been the best friend
>>>> of the i915 driver. With linux-2.6.38-gentoo-r4 it has the problem
>>>> that the screen remains blank after the lid is closed and reopened, but
>>>> that problem I can live with. With 3.0.0-r1 I am back to a former
>>>> problem that the screen goes (and remains) blank while booting.
>>>>
>>>> The next step I will do is to test linux-2.6.39-gentoo, probably I
>>>> did not notice information that I have to adjust boot parameters or the
>>>> kernel config?
>>>
>>> based on my having lived through the i915 "black screen of death",
>>> pulling out my handy "git bisect" and with advice from chris wilson,
>>> these days, i simply apply this patch to the source:
>>>
>>> diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
>>> index d2c7104..a1a5d03 100644
>>> --- a/drivers/gpu/drm/i915/intel_opregion.c
>>> +++ b/drivers/gpu/drm/i915/intel_opregion.c
>>> @@ -152,6 +152,8 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
>>> struct opregion_asle *asle = dev_priv->opregion.asle;
>>> u32 max;
>>>
>>> +return ASLE_BACKLIGHT_FAILED; // rday
>>> +
>>> if (!(bclp & ASLE_BCLP_VALID))
>>> return ASLE_BACKLIGHT_FAILED;
>>>
>>>
>>> i tried taking it out a couple of times and immediately got the same
>>> i915-related problem so until i hear differently, the patch stays in.
>>
>> Thanks for the hint. I tested the patch with 3.0.0-rc1 and
>> unfortunately the symptoms remain the same.
>>
>> Meanwhile, I tested 2.6.39-gentoo as well and it also causes that
>> problem. So, this is not really a (new) 3.0.0-rc1 issue.
>>
>> Best regards,
>>
>> Dirk
>
> Your patch reminded me of another patch of Chris that caused problems
> for several other people, but manually applied to the changed context in
> 3.0.0-rc1 again works for me:
>
> --- linux-3.0-rc1/drivers/gpu/drm/i915/intel_bios.c 2011-05-30 02:43:36.000000000 +0200
> +++ /usr/src/linux-3.0-rc1/drivers/gpu/drm/i915/intel_bios.c 2011-05-31 20:53:35.000000000 +0200
> @@ -267,7 +267,7 @@
> case 4:
> return alternate ? 100 : 96;
> default:
> - return alternate ? 100 : 120;
> + return alternate ? 120 : 100;
> }
> }
>
> The strange thing is that I am pretty sure that I did not have to modify
> 2.6.28-gentoo{,-r4} what I at that time also reported here:
> https://bugs.freedesktop.org/show_bug.cgi?id=31596

For completeness I want to report that I did a bisect and found out that
the following commit seems to be the one that reintroduced the problem
that I have to manually patch the kernel to avoid a blank screen
(with backlight turned on) during boot:

47a05eca72991039e788b25232061f9c9df9ec23 is the first bad commit
commit 47a05eca72991039e788b25232061f9c9df9ec23
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date: Mon Feb 7 13:46:40 2011 -0800

drm/i915: disable PCH ports if needed when disabling a CRTC

Disable any PCH ports associated with a pipe when disabling it. This
should prevent transcoder disable failures due to ports still being on.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
[ickle: introduce *_PIPE_ENABLED() macro]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

:040000 040000 2c7c54cceb89821941943614cede86c4a2c2a8bc 9382527ee169beb54a10eb0afe8a69d418025c2e M drivers

Dirk


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