I've installed Ubuntu 12.04 on my Toshiba Satellite L645D and the screen brightness does not work. Any suggestions?
You might want to edit your xorg.conf configuration. In a terminal, type:
This will make a backup of your xorg.conf file - just in case :) That being done, type:
and under Section "Device" add the following line:
Save and reboot.
Perhaps this already does the trick. In that case, congratulations!
I know it is a bit late but I had the exact same problem with my girlfriend's computer, a Toshiba Satellite L645D with Ubuntu 14.04 LTS. I think this fix should also work on this computer model with other Debian-related Distros.
After searching and trying everything in the web I found this page:
So what I did to fix the problem was open /etc/default/grub with nano (or whatever text editor you may like):
And search the line that starts with: GRUB_CMDLINE_LINUX_DEFAULT="(something)" I don't remember exactly what text it had on the quotes. And make it look like:
Then update the grub with:
Finally, reboot and that's it! Hope that helps :D