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SubjectRe: [Intel-gfx] Bad flicker on skylake HQD due to code in the 4.7 merge window
On Sun, 11 Sep 2016, James Hogan <> wrote:
> I've just bisected a similar (same?) problem (slow increase and
> decrease of screen brightness with a period of a few seconds) to the
> same commit (this is on a Dell XPS 13 laptop)
> commit a05628195a0d9f3173dd9aa76f482aef692e46ee
> Author: Ville Syrjälä <>
> Date: Mon Apr 11 10:23:51 2016 +0300
> drm/i915: Get panel_type from OpRegion panel details
> the difference for me is that good commits used the acpi backlight,
> and bad ones used the intel backlight (/sys/class/backlight/). Its
> like intel_backlight is fighting with the firmware to control the
> backlight or something. Reverting the commit on v4.7.3 switches it
> back to the acpi backlight and all works nicely again.
> let me know if I can provide anything else to help debug.

Please try [1].



Jani Nikula, Intel Open Source Technology Center

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