13.04asusbrightnessxubuntu
I've recently upgraded to Xubuntu 13.04 and noticed that I'm unable to use the brightness keys to adjust the brightness of my screen. I've tried just about everything this thread suggest and I'm still unable to find a solution. If it helps at all I'm using an ASUS eeepc 1025c.
Thanks for your time.
To get working brightness key. try following
press Alt+f2 , execute gksudo gedit /etc/default/grub
Change this line
GRUB_CMLINE_LINUX_DEFAULT="quiet splash"
to something like below
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Open a terminal by Alt+ctrl +T, Execute sudo update-grub and reboot . See if brightness keys are working.
If the above is not working set a fixed value for brightness. To do so,
Open a terminal by pressing Alt+ctrl+T.
Type ls /sys/class/backlight/*/brightness, copy the outputs to a separate text file
The possibility is there will be two paths,try the following for each path and replace accordingly
example paths will be like
/sys/class/backlight/acpi_video0/brightness
Run following commands in terminal,
cat /sys/class/backlight/acpi_video0/max_brightness
Try a lower value to set the brightness, say output is 16 so I will try with half of it
echo 8 | sudo tee /sys/class/backlight/acpi_video0/brightness
If this works, make this happen in each login automatically by doing the following
gksu gedit /etc/rc.local
Enter this line just before exit 0. It should look like
echo YOUR_VALUE_HERE > /sys/class/backlight/acpi_video0/brightness
exit 0
Also you can try with xdotool
I am having the same problem with Ubuntu 13.10 install. My brightness shortcut keys (Fn + F5/F6) worked in 12.10 as well as 13.04.
I am using Sony Vaio SVE15113ENB with VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09). Any help is appreciated.
I have tried:
Best Answer
You can changing the brightness using the command line on this thread. It's not a perfect solution but it will allow you to give you control in adjusting. You can always write a bash script afterwards.
Source: How to change LCD brightness from command line (or via script)?