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#1 2014-08-25 11:33:40

Bersam
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From: Isfahan
Registered: 2010-10-03
Posts: 30
Website

[SOLVED] brightness control doesn't work anymore [Lenovo G580]

Hi everybody,

Seems after last update to "Linux GNU 3.16.1-1-ARCH" x86_64, brightness keys doesn't work anymore. but volume keys work just fine.

Got anybody any idea what is the problem?

Using updated Archlinux with i3wm.

[Update]

I can change brightness with this command:

sudo tee /sys/class/backlight/intel_backlight/brightness <<< 800

but brightness keys doesn't work anymore.

[UPDATE-2]

Thanks to teateawhy, adding "video.use_native_backlight=0" to kernel parameter solved my problem; just do not forget to run

 sudo grub-mkconfig -o /boot/grub/grub.cfg

after adding that param to kernel parameters.

Last edited by Bersam (2014-09-10 08:51:22)

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#2 2014-08-25 11:36:36

Head_on_a_Stick
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From: Asteroid B-612
Registered: 2014-02-20
Posts: 4,052
Website

Re: [SOLVED] brightness control doesn't work anymore [Lenovo G580]

Hardware specs?
I lost the use of my XF86 brightness keys with kernel 3.16, but gained recognition of the display in the xbacklight program: I use that now.
(Intel HD4600)


"Il semble que la perfection soit atteinte non quand il n'y a plus rien à ajouter, mais quand il n'y a plus rien à retrancher." - Antoine de Saint Exupéry

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#3 2014-08-25 11:43:14

Bersam
Member
From: Isfahan
Registered: 2010-10-03
Posts: 30
Website

Re: [SOLVED] brightness control doesn't work anymore [Lenovo G580]

Head_on_a_Stick wrote:

Hardware specs?
I lost the use of my XF86 brightness keys with kernel 3.16, but gained recognition of the display in the xbacklight program: I use that now.
(Intel HD4600)

I have Intel HD 4000 (loaded with i915 kernel driver) (Lenovo G580)

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#4 2014-08-25 11:56:58

Head_on_a_Stick
Member
From: Asteroid B-612
Registered: 2014-02-20
Posts: 4,052
Website

Re: [SOLVED] brightness control doesn't work anymore [Lenovo G580]

Yeah, try using the xbacklight program & bind some keys for it.
EDIT: you could try messing around with your kernel parameters, I didn't bother.

Last edited by Head_on_a_Stick (2014-08-25 11:58:29)


"Il semble que la perfection soit atteinte non quand il n'y a plus rien à ajouter, mais quand il n'y a plus rien à retrancher." - Antoine de Saint Exupéry

How to report a problem

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#5 2014-08-26 12:11:40

teateawhy
Member
From: GER
Registered: 2012-03-05
Posts: 1,077
Website

Re: [SOLVED] brightness control doesn't work anymore [Lenovo G580]

On my thinkpad adding this kernel parameter helped:

video.use_native_backlight=0

Also see this thread:
https://bbs.archlinux.org/viewtopic.php?id=184949

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