https://bugs.kde.org/show_bug.cgi?id=494730

--- Comment #1 from [email protected] ---
The following items are available in /sys/class/backlight:

- intel_backlight
- card1-eDP-2-backlight
- asus_screenpad

The first independently controls the first display, and the second does the
second. I take this to mean that the issue is occurring at a level higher than
the kernel, at least.

(The third entry does nothing. I suspect there is some sort of false positive
causing the ASUS WMI driver to think this device has a screenpad).

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