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

[Romain Francoise]

Jani Nikula <jani.nikula at intel.com> writes:

> 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.

Done, https://bugs.freedesktop.org/show_bug.cgi?id=76276

Let me know if you need more info.

> Do you have the snb or ivb model?

IVB.

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

That's more difficult to procure, is it really necessary?

Thanks,
-r