My system specifications are: Ubuntu 12.04, 64-bit, Acer Aspire One D270, Intel Atom CPU
The usual brightness increase/decrease key combination using Fn key doesn't work in Ubuntu as many pointed out.
I had found two solutions on this forum to set the screen brightness.
One was to make the usual key combination work answer is given here:
and the other is using the command
sudo setpci -s "00:02.0" F4.B=20
20 is a hexadecimal number representing brightness.
It's only the latter that worked in my case.
I observe that the original brightness setting is restored after resumption from sleep mode.
All I want is to keep my brightness setting permanent. How do I do that?
Try 1: Tried Alok's suggestion. It just sits there as a startup application. Doesn't figure as an icon on the topbar of the screen, like the dropbox icon (my dropbox account it is linked to ubuntu) so that I can conveniently change the brightness.
Try 2: Also I must add, that the method
System Settings -> Additional Drivers gives an empty list. In my earlier install (which I had to overwrite-reinstall :-(), the list had (I think) Intel Cedarview Graphics Driver. So must I install before trying the methods in any of the answers below?
Update: I read somewhere Intel CedarView is only for 32-bit OS!
Try 3: Just tried the quiet_splash etc that I had to add to /etc/default/grub, even read the thread given in one of the answers below!
Temporarily settled myself with this method:
Try 4a: I created an environment variable BRI ensured using
env it's there in the list, and tried using it, here's the bash file brightness.sh
#!/bin/bash echo "Set Brightness (Values 00-FF): " read s sudo setpci -s "00:02.0" F4.B=$s export BRI=s
However I have to give the administrative password, and have yet not succeeded in making it a permanent setting and am working on these aspects!
Try 4b: I even tried (in vain)
/etc/bash.bashrcthrough the shell script
brightness.shthat I made
as I in each case restart and find BRI to still have its old value, and not the one given by executing brightness.sh via the launcher!