[Bug 111202] [Regression]: intel_backlight fails to change eDP1 brightness on Dell Precision 5540 (Coffeelake)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111202

--- Comment #1 from Arcadiy Ivanov <arcadiy at ivanov.biz> ---
Created attachment 144858
  --> https://bugs.freedesktop.org/attachment.cgi?id=144858&action=edit
debug dmesg of drm-tip 2019y-07m-23d-12h-27m-47s UTC

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