I bought a new Laptop with Ubuntu some days ago. On Ubuntu everything was working well - so I decided to make a fresh Arch install with KDE. Most things work out of the box, but I can't control brightness. Even the fn-button to power off the display works as well...
I tried to put parameters at /etc/default/grub, but nothing happened:
GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=Linux acpi_backlight=vendor"
or with "acpi_osi=Linux acpi_backlight=legacy" and "acpi_osi=!Windows 2012".
Thanks for helping me!
found a solution
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
for more infos see Christopher’s Blog.
Last edited by P3808 (2013-03-24 18:52:07)