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HP 15-ba053nr laptop

uses the xserver-xorg-video-amdgpu package, not available in debian jessie, but available in stretch. Currently running arch though for best compatibility.
- backlight needs special kernel parameters.
----- " acpi=force acpi_backlight=vendor "
And the usual echo ### > /sys/class/backlight/amdgpu_b10/brightness
where ### is 0 - 255 changes the brightness of the LCD, 0 being off
xbacklight doesn't seem to recognize the device, although same issue going from debian jessie to stretch for my hp stream 11.
The /sys/class/... is root:root by default, so change that after boot if you want the user to use it, otherwise only as root does it work.
Thank you !!
Reference http://www.linuxquestions.org/questions/linux-hardware-18/hp-15-ba053nr-laptop-4175610081/

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