[Intel-gfx] [PATCH] drm/i915: inverted brightness quirk for HP 2000 Notebook

[Rodrigo Vivi]

Hi Laurent,

is it possible to get the i915_opregion from your debugfs?
probably under /sys/kernel/debug/dri/0/i915_opregion

Thanks,
Rodrigo.

On Wed, Aug 28, 2013 at 3:23 PM, Jani Nikula <jani.nikula at intel.com> wrote:
> On Wed, 28 Aug 2013, Daniel Vetter <daniel at ffwll.ch> wrote:
>> On Wed, Aug 28, 2013 at 7:38 PM, Rodrigo Vivi <rodrigo.vivi at gmail.com> wrote:
>>> 01.org forum: https://01.org/linuxgraphics/node/199
>>>
>>> Slot:  00:02.0
>>> Class: VGA compatible controller [0300]
>>> Vendor:    Intel Corporation [8086]
>>> Device:    2nd Generation Core Processor Family Integrated Graphics Controller [0106]
>>> SVendor:   Hewlett-Packard Company [103c]
>>> SDevice:   Device [1854]
>>> Rev:       09
>>>
>>> Reported-by: Laurent Chardon <laurent.chardon at gmail.com>
>>> Cc: Jani Nikula <jani.nikula at intel.com>
>>> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
>>
>> All the inverted brightness machines we've seen have been gen4 and
>> Acer/Packard Bell. I suspect there's something amiss in our backlight
>> handling and at least for current platforms I don't want to merge
>> quirks before we've reasonably proven that we really need them. Which
>> means someone should show that Windows has specific code for this HP
>> laptop first ...
>
> Agreed. I'd be wary of adding inverted backlight quirks for anything
> other than gen4 Acers (or their other brands).
>
>> One thing I remember is that there's a linearization table in the vbt
>> somewhere, maybe that does the trick. Or we simply race our driver
>> against something in the firmware and inverting the brightness here
>> cures that.
>
> If you get the reporter to dump the i915_opregion file from debugfs, I
> could check the table.
>
> Cheers,
> Jani.
>
>
>
>> -Daniel
>> --
>> Daniel Vetter
>> Software Engineer, Intel Corporation
>> +41 (0) 79 365 57 48 - http://blog.ffwll.ch



-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br