[Intel-gfx] v3.14-rc7: Backlight control broken on Dell XPS13

[Jani Nikula]

On Mon, 17 Mar 2014, Jani Nikula <jani.nikula at intel.com> wrote:
> On Mon, 17 Mar 2014, Romain Francoise <romain at orebokech.com> wrote:
>> Hi Daniel,
>>
>> Daniel Vetter <daniel.vetter at ffwll.ch> writes:
>>
>>> Please never just send a mail to maintainers, always cc mailing lists.
>>
>> Yes, sorry, I sent this privately because it wasn't a fully-formed bug
>> report; I just wanted Jani to confirm that it wasn't intentionally
>> broken as of -rc7.
>>
>>> Have you tested with the patch reverted to confirm that it's indeed
>>> this commit and not something else (e.g. in the acpi code)?
>>
>> I hadn't, but I've now reverted the revert and things work again as in
>> v3.13. So as far as I can tell the quirk is still definitely needed.
>
> I still don't think having the quirk is the way to go. Let's fix this
> properly, shall we?
>
> Please file a new bug on DRM/Intel component at [1]. Please attach
> intel_reg_dumper output (tool from intel-gpu-tools [2]) with and without
> the revert. Please also attach dmesg with drm.debug=0xe from early boot.

The register dump from *before* i915 gets loaded is also interesting.

BR,
Jani.

>
> Do you have the snb or ivb model?
>
> BR,
> Jani.
>
>
> [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
> [2] http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/
>
>>
>> Thanks!
>> -r
>
> -- 
> Jani Nikula, Intel Open Source Technology Center
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-- 
Jani Nikula, Intel Open Source Technology Center