Cannot adjust brightness on Optimus laptop

asked 2018-08-04 22:25:43 -0600

updated 2018-08-10 01:38:12 -0600

Kernel version: 4.17.9-200.fc28.x86_64
Driver: xorg-x11-drv-intel 2.99.917-32.20171025, nvidia-driver 396.45-1
MB Info: CLEVO P95XER/EP6

Result of lspci | grep VGA:
00:02.0 VGA compatible controller: Intel Corporation Device 3e9b
01:00.0 VGA compatible controller: NVIDIA Corporation GP106M [GeForce GTX 1060 Mobile] (rev ff)

/sys/class/backlight/ is empty. No intel_backlight found in /sys/. Even no brightness file in /sys/devices/pci0000:00/0000:00:02.0/.

Tried:
- enable or disable Bumblebee
- acpibacklight=vendor or video or intel or native or none
- acpi
osi=
- video.usenativebacklight=1
- video.usebiosinitial_backlight=0

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