I tried all the workarounds listed an here are my results:
Booting with defaults:
- Brightness hotkeys does not work.
- Brightness slider in Power Management works.
-------
Booting with: acpi_backlight=vendor
- Brightness hotkeys does not work.
- Brightness slider in Power Management does not work.
-- Further testing with the above boot command.
cgp-linux cgp # ls /sys/class/backlight/
asus-nb-wmi intel_backlight
-- echo 8 > /sys/class/backlight/intel_backlight/brightness
-- This command turns the screen black (off) completely. I tried higher value
(1000) and it properly decreases the brightness.
-------
Booting with: video.use_bios_initial_backlight=0
- Brightness hotkeys does not work.
- Brightness slider in Power Management works.
-------
Booting with: video.use_native_backlight=1
- Brightness hotkeys does not work.
- Brightness slider in Power Management works.
-------
Booting with: acpi_backlight=vendor
and the file /usr/share/X11/xorg.conf.d/80-backlight.conf
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that
works here
BusID "PCI:0:2:0"
EndSection
- Brightness hotkeys does not work.
- Brightness slider in Power Management works.
-------
Booting with: acpi.brightness_switch_enabled=0
- Brightness hotkeys does not work.
- Brightness slider in Power Management works.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1460088
Title:
Backlight control does not work on Asus Zenbook Pro UX501JW / Nvidia
Geforce GTX 960M
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