[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 #17 from Dan Sanders <dan at ified.ca> ---
I have re-tested with cod/tip/drm-intel-next/2017-09-30
(e18063e88bd579c479a2b45820be6c4625f841c3) from the kernel-ppa.


> Maybe it has nothing to do, but just in case, have you tried the
> "acpi_backlight=vendor" method?

Yes, I have tested this. It does not help.

> 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?

There is only intel_backlight (c.f. #8). intel_backlight has a max_brightness
(852), but changing brightness has no effect.

> Hello Dan, any change on this?

There is no change. Considering that Intel shipped a special release of their
Windows driver just for this laptop to fix brightness controls, I do not expect
to be surprised by a fix.

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