I wasn't able to get the brightness working. So far I've tried:
Controlling via /sys/class/backlight/acpi_video0
- max brightness was 15
- does not respond to "echo 5 > /sys/class/backlight/acpi_video0/brightness"
- "cat /sys/class/backlight/acpi_video0/actual_brightness" shows 5 but have no effect
Controlling via /sys/class/backlight/intel_backlight
- changing the brightness value will result in screen flicker
- have to max it out to get rid of the flicker
Does anyone have arch working on this model? I'm lost.