Cant adjust the screen brightness on Samsung N150 with netbook remix.
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Incomplete
|
Undecided
|
Unassigned |
Bug Description
I have no complaints about Netbook Remix and 9.10 except that i cant adjust the screen brightness. its always at half.
Very occaisionally and i dont know why it will be at 100% when first boot, so and get a drink and 5 mins later its at 50% again.
Function keyswork for sound, but not for screen brightness.
any ideas.,
Sean
ProblemType: Bug
Architecture: i386
Date: Wed Mar 24 23:02:36 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu-
Package: firefox-3.5 3.5.8+build1+
ProcEnviron:
LANG=en_AU.UTF-8
SHELL=/bin/bash
ProcVersionSign
SourcePackage: firefox-3.5
Tags: ubuntu-unr
Uname: Linux 2.6.31-20-generic i686
I have the same problem with 10.04 Beta on the N150.
A workaround is to create a file called brightness.sh somewhere with this content:
#!/bin/sh
sudo setpci -s 00:02.0 F4.B=$1
Then just execute: chmod a+x brightness.sh
After that you can execute brightness.sh with a hex number between 0 (off) and ff (full brightness) like this:
./brightness.sh 50
This is kind of ugly but it is much better than not being able to change brightness at all.
I'm not an expert on kernel and X dirvers but for me the problem seems to be that the X driver doesn't support the xrandr brightness property. If I call xrandr --verbose on the N150 this property doesn't appear while it is present if I execute the same command on a machine where changing the brightness with the gnome panel applet works.