Using Mainline Kernel 4.19.0 or above, it works. So it's a bug in the
Ubuntu 18.10 Kernel Version.
Maybe it's this 4.19 patch.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=61c4fc1eaf736344904767d201b0d4f7a2ebaf79
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-settings-daemon (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/178802
Same problem on an Asus UX331U. In Ubuntu 18.04 setting kbd backlight
worked, it's broken in Ubuntu 18.10.
Oct 1 17:43:19 avis gsd-power[2143]:
gsd_power_backlight_abs_to_percentage: assertion 'max > min' failed
i am able to manually control the backlight on the shell using
sudo tee /sys/class/l
