[Bug 97883] [i915] intel_backlight does not function - Lenovo X1 Yoga OLED

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97883

--- Comment #7 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Dan Sanders from comment #5)
> [    1.816434] [drm:intel_edp_init_dpcd] EDP DPCD : 02 00 00

Okay, this means i915.enable_dpcd_backlight=1 doesn't matter.

What's under /sys/class/backlight/? Under each directory there, can you change
backlight by echoing (as root) values between 0 and $(cat max_brightness) to
the brightness sysfs attribute file?

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