Arch Linux

beebop

Member

Registered: 2011-12-23

Posts: 3

Can't Adjust Screen Brightness

Hi,

I recently installed Arch and can't seem to adjust the screen brightness.

I'm running xfce4 with the applet that allows me to change brightness and it just says: no output device
I also tried xbacklight and it says: No outputs have backlight property
I have these kernel parameters set: nomodeset acpi_backlight=vendor acpi_osi=Linux

All to no avail.

My video card is a Radeon 6950 and I'm using the catalyst drivers from AUR so I have fglrx

Anyone know how I can fix this?

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,701

Re: Can't Adjust Screen Brightness

Does your system have a directory called /sys/class/backlight/intel_backlight/ ??  If so, what are the files in the directory ?

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moetunes

Member

From: A comfortable couch

Registered: 2010-10-09

Posts: 1,033

Re: Can't Adjust Screen Brightness

I have an acer aspire laptop and the only way I could adjust the brightness was with

acpi_osi= 

in the kernel line and I can only adjust the brightness with the Fn keys. The files in /sys/class/backlight never change...

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You're just jealous because the voices only talk to me.

beebop

Member

Registered: 2011-12-23

Posts: 3

Re: Can't Adjust Screen Brightness

@ewaller I only have /sys/class/backlight and there's nothing in it.