Messages in this thread | | | Date | Thu, 16 Jun 2011 11:41:46 -0700 | From | Jesse Barnes <> | Subject | Re: [2.6.39] drm/i915: blank screen on Lenovo Ideapad U160 |
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On Thu, 16 Jun 2011 19:54:36 +0200 Dirk Gouders <gouders@et.bocholt.fh-gelsenkirchen.de> wrote:
> Jesse Barnes <jbarnes@virtuousgeek.org> writes: > > > On Thu, 16 Jun 2011 13:49:11 +0200 > > Dirk Gouders <gouders@et.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?
No, we should be parsing the VBT differently in your case it appears. But the simple change above will break other platforms, so it's possible we're missing a VBT format change and need to parse it differently depending on the version.
-- Jesse Barnes, Intel Open Source Technology Center
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