Arch Linux

ikrivosheev

Member

Registered: 2018-09-22

Posts: 5

Problem with Backlight

Hello, I have laptop HP, arch + gnome3. I have some problem with backlight configuration. Default hotkeys (F2, F3) not working.

1)

ikrivosheev@hp-pavilion:[/etc/modprobe.d]$ ls /sys/class/backlight/
intel_backlight

2) xorg.conf

Section "Device"
  Identifier  "Intel Graphics"
  Driver      "intel"
  Option      "TeraFree"	"true"
  BusID       "PCI:0:2:0"
EndSection

3) I see in arch wiki kernek parameters: acpi_backlight, etc... How i can set kernel parameters in efistab? EFISTAB - is my boot loader, not grub.

I create custom shortcuts in gnome with xbacklight. How fix this problem?

Last edited by ikrivosheev (2018-09-22 20:18:44)

Piri

Member

Registered: 2018-06-02

Posts: 70

Re: Problem with Backlight

Just a guess but try adding following line to your xorg.conf

Option       "Backlight" "intel_backlight"

ikrivosheev

Member

Registered: 2018-09-22

Posts: 5

Re: Problem with Backlight

Not help...

ikrivosheev

Member

Registered: 2018-09-22

Posts: 5

Re: Problem with Backlight

My UEFI boot:

efibootmgr --disk /dev/nvme0n1 -p 1 --create -L Arch Linux --loader /vmlinuz-linux --unicode 'root=PARTUUID=... rw initrd=\initramfs-linux.img' --verbose

If I add kernel parametr:

efibootmgr --disk /dev/nvme0n1 -p 1 --create -L Arch Linux --loader /vmlinuz-linux --unicode 'root=PARTUUID=... rw kernel.acpi_backlight=video initrd=\initramfs-linux.img' --verbose

After start system, sysctl -a - I can not find a flag

Last edited by ikrivosheev (2018-09-22 21:35:13)

KucharczykL

Member

Registered: 2017-09-29

Posts: 2

Re: Problem with Backlight

Can you set the backlight directly (tee /sys/class/backlight/DEVICE/brightness <<< NUMBER)?

ikrivosheev

Member

Registered: 2018-09-22

Posts: 5

Re: Problem with Backlight

Yes, I can set.

Some more informations.
If I run:

sudo showkey -s

and enter Fn+F2, Fn+F3 - output is empty.