Thanks Kaihenfeng! I try it from [2], but /sys/class/backlight still empty. Ops! ...
[2] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc3/
Thanks Kaihenfeng! I try it from [2], but /sys/class/ backlight still empty. Ops! ...
[2] http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.17-rc3/