Unable to change screen brightness with hotkeys on Ubuntu 14.10

Question

Just upgraded to Ubuntu 14.10, and now my brightness keys aren't working. Is there a fix for this? I suspect that Linux kernel 3.16 is the culprit...

Answer 1

I had the same issue.

For me it helped to remove a piece of the grub command line which was needed before in Ubuntu 14.04

From the grub file I removed a boot parameter as follow.

sudo nano /etc/default/grub

Look up the line that looks more or less like this.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"

remove the text piece: acpi_osi=Linux In my case the adjusted line is:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

save file

sudo update-grub
sudo reboot