So Your screen is normally bright but for whatever reason when You boot up to PCLinuxOS the brightness level is very low?
xbacklight via synaptic
2) Open terminal and
su to root
3) List the content of the folder
/sys/class/backlight with this command:
ls --full /sys/class/backlight
4) You should get few hits:
[root@wishmacer backlight]# ls –full /sys/class/backlight
lrwxrwxrwx 1 root root 0 2012-11-04 02:10:05.023004946 +0000 acer-wmi -> ../../devices/platform/acer-wmi/backlight/acer-wmi/
lrwxrwxrwx 1 root root 0 2012-11-04 02:09:09.784000471 +0000 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/
5) Now You need to get Your command right. We are gonna push the variable into the correct folder. The variable and the folder will be different on all machines but I think it’s safe to assume the variable values go from 1 to 15.
6) So knowing that let’s try the intel_backlight folder first:
echo -n 15 > /sys/class/backlight/intel_backlight/brightness
This however didn’t go so well.
[root@wishmacer backlight]# echo -n 15 > /sys/class/backlight/intel_backlight/brightness
bash: echo: write error: Invalid argument
7) So let’s try the acer-wmi folder:
echo -n 15 > /sys/class/backlight/acer-wmi/brightness
BINGO! Screen got bright.
8) Now that You know what folder/file to modify – try changing the variable from 15 and see if You get better results with other numbers. See if You can go 16 or 14 for example.
8) When Your command is ready open Your favorite text editor as root and modify the
/etc/rc.local file by adding the command as a last line.
9) Save the file and reboot.
Hope this helps!