Arch Linux

voeck

Member

From: Karlsruhe, Germany

Registered: 2007-10-31

Posts: 18

[solved] Screen brightness in KDE 4.2

Hi!

I have a little problem with the new power managment of KDE 4.2. While frequency scaling is working very well the screen brightness cannot be changed. At least not as normal users. Even

solid-powermanagement brightness set 0

has no effect. But if I log in as root it works as aspected. So I guess there is somewhere a permission problem. To what group do I have to add my user? Adding it to "power" doesn't work. Or do I have to modify some HAL policies?

Can anyone maybe help me?

Last edited by voeck (2009-01-29 09:11:10)

toad

Member

From: if only I knew

Registered: 2008-12-22

Posts: 1,775

Website

Re: [solved] Screen brightness in KDE 4.2

Works a treat for me. Here are my groups:

[toad@myhost ~]$ cat /etc/group|grep toad
tty::5:toad                             
disk::6:root,toad
uucp::14:toad
log::19:root,toad
locate::21:toad
games::50:toad
network:x:90:toad
video:x:91:toad
audio::92:toad
optical::93:toad,hal
storage:x:95:toad,hal
scanner:x:96:toad
power:x:98:toad
users::100:toad
[toad@myhost ~]$

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never trust a toad...
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voeck

Member

From: Karlsruhe, Germany

Registered: 2007-10-31

Posts: 18

Re: [solved] Screen brightness in KDE 4.2

Okay, I problem disappeared. Apparently just logging out after adding me to the "power" group was not enough. A full reboot did to trick. Although the brightness slider sometimes is a bit confused and reports the wrong brightness. But I consider this issue as solved. Thank you!

smyp

Member

Registered: 2008-08-20

Posts: 9

Re: [solved] Screen brightness in KDE 4.2

I have exactly the same problem, however I'm already in the 'power' group, so if you have more ideas on this issue...

brazzmonkey

Member

From: between keyboard and chair

Registered: 2006-03-16

Posts: 818

Re: [solved] Screen brightness in KDE 4.2

I have exactly the same problem, however I'm already in the 'power' group, so if you have more ideas on this issue...

Same here...

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what goes up must come down

Skittles

Member

From: Bochum (Ger)

Registered: 2007-07-21

Posts: 36

Re: [solved] Screen brightness in KDE 4.2

#3

Is it maybe a problem with the nvidia driver? using x64

Last edited by Skittles (2009-02-12 17:53:36)

brazzmonkey

Member

From: between keyboard and chair

Registered: 2006-03-16

Posts: 818

Re: [solved] Screen brightness in KDE 4.2

#3

Is it maybe a problem with the nvidia driver? using x64

Could be. I have an nvidia on 64-bit too.

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what goes up must come down

Skittles

Member

From: Bochum (Ger)

Registered: 2007-07-21

Posts: 36

Re: [solved] Screen brightness in KDE 4.2

for me, it works again, I don't know why

brazzmonkey

Member

From: between keyboard and chair

Registered: 2006-03-16

Posts: 818

Re: [solved] Screen brightness in KDE 4.2

I think the update to KDE 4.2.2 fixed it.

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what goes up must come down