Installed the 19.04 daily image, the kernel is 4.18.0-11-generic. It works fine. And the brightness value is 255.
$ cat /sys/class/backlight/amdgpu_bl0/brightness 255 $ cat /sys/class/backlight/amdgpu_bl0/actual_brightness 255 $ cat /sys/class/backlight/amdgpu_bl0/max_brightness 255
Installed the 19.04 daily image, the kernel is 4.18.0-11-generic. It works fine. And the brightness value is 255.
$ cat /sys/class/ backlight/ amdgpu_ bl0/brightness backlight/ amdgpu_ bl0/actual_ brightness backlight/ amdgpu_ bl0/max_ brightness
255
$ cat /sys/class/
255
$ cat /sys/class/
255