Mit dieser Anleitung war der Fehler mit meinem Samsung n 220 behoben
The first step is to have the /etc/default/grub following line modified as stated at the beginning of this topic:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor intel_idle.max_cstate=0"
Then run:
sudo update-grub; sudo update-initramfs -u
Second, blacklist your samsung-backlight module, so it won't be loaded at bootup. To do so, edit /etc/modprobe.d/blacklist.conf and add the following text to the end of it:
blacklist samsung-backlight
And third, edit /etc/rc.local and paste the next command one line before the "exit 0" statement that you'll find at the end of the file:
modprobe samsung-backlight
By doing so, you're loading the samsunbg-backlight module after all the other drivers are loaded. I don't know why, but by doing so the problem's gone here.