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I have installed openSUSE Leap 15.1 on an acer c720 chromebook and cannot adjust the screen brightness, neither by function keys nor the following.

~ $ xbacklight
No outputs have backlight property
~ $ cat /sys/class/backlight/acpi_video0/brightness
cat: /sys/class/backlight/acpi_video0/brightness: No such file or directory

From https://forums.opensuse.org/showthre...ss-in-openSUSE I also tried adding

acpi_osi=\"!Windows 2012\"

at the end of '/etc/sysconfig/bootloader', and rebooted. All to no effect.

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