linux-kernel - Re: [2.6.39] drm/i915: blank screen on Lenovo Ideapad U160

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Message-ID: <gisjr9ll0j.fsf@mx10.gouders.net>
Date:	Thu, 16 Jun 2011 19:54:36 +0200
From:	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-kernel@...r.kernel.org,
	Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [2.6.39] drm/i915: blank screen on Lenovo Ideapad U160

Jesse Barnes <jbarnes@...tuousgeek.org> writes:

> On Thu, 16 Jun 2011 13:49:11 +0200
> Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de> wrote:
>
>> Some redundant information, but if I change one line at another place
>> in the i915 code (whithout the above modification) the result is more
>> satisfactory on my machine, because in that case the display even works
>> after I close and reopen the lid:
>> 
>> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
>> index 927442a..ebb67ae 100644
>> --- a/drivers/gpu/drm/i915/intel_bios.c
>> +++ b/drivers/gpu/drm/i915/intel_bios.c
>> @@ -267,7 +267,7 @@ static int intel_bios_ssc_frequency(struct drm_device *dev,
>>         case 4:
>>                 return alternate ? 100 : 96;
>>         default:
>> -               return alternate ? 100 : 120;
>> +               return alternate ? 120 : 100;
>>         }
>>  }
>
> Does your machine also work if you set the lvds_use_ssc param to 0?

Yes, that works!
I undid all modifications, compiled the i915 driver as a module (I am
not sure if that is necessary) und used i915.lvds_use_ssc=0 as a
further bootparameter, I will attach the dmesg output.

Would you say "This problem was just a case of wrong parameter usage",
then?

Dirk


View attachment "dmesg.txt" of type "text/plain" (32877 bytes)