Arch Linux

badministrator

Member

Registered: 2014-05-27

Posts: 19

[SOLVED] Can't change laptop screen brightness.

I'm using GNOME and can't seem to change my laptop screen brightness. The slider in settings will work by changing the value in intel_backlight between 0 and 4882 but the actual brightness of the screen will not change.

If I use the kernel line acpi_video = vendor all it does is create another interface called dell_backlight alongside intel_backlight which changes from 0 to 15 by changing the slider or pressing fn  + f5 and fn + f4.

I have nouveau and intel graphics drivers installed and I'm running arch on a Dell XPS15 (L521x).

Any help would be appreciated.

EDIT: Solved this by adding the kernel parameter video.use_native_backlight=0

Last edited by badministrator (2015-04-12 05:33:33)

Head_on_a_Stick

Member

From: London

Registered: 2014-02-20

Posts: 7,763

Website

Re: [SOLVED] Can't change laptop screen brightness.

Have you tried this kernel parameter:

video.use_native_backlight=1

Other possibilities listed here:
https://wiki.archlinux.org/index.php/In … adjustable

---

Are you infected with Wetiko?

samtech09

Member

Registered: 2014-12-10

Posts: 50

Re: [SOLVED] Can't change laptop screen brightness.

Few (not all) Dell panel support adjusting backlight through xrandr. I can control backlight on my M4800 through it.
What's the output of following

xrandr --prop | grep Backlight

badministrator

Member

Registered: 2014-05-27

Posts: 19

Re: [SOLVED] Can't change laptop screen brightness.

Few (not all) Dell panel support adjusting backlight through xrandr. I can control backlight on my M4800 through it.
What's the output of following

xrandr --prop | grep Backlight

No output at all.

badministrator

Member

Registered: 2014-05-27

Posts: 19

Re: [SOLVED] Can't change laptop screen brightness.

Have you tried this kernel parameter:

video.use_native_backlight=1

Other possibilities listed here:
https://wiki.archlinux.org/index.php/In … adjustable

Yes I have tried this, unfortunately GDM will not start if this is enabled.