Hello, I installed these now. My nVidia drivers broke because of them,
so I'm back to Gnome. Brightness switching is just as troublesome as it
was originally.

Readding acpi_backlight=vendor.
*sudo update-grub*
*reboot*

It isn't exactly fixed, I noticed when the problems occur now, it is
when I adjust the brightness fast and repeatedly. It then goes a bit up
and down, but no more than one step, with acpi etc.

So it behaves the same irregardless of kernels.

I'll attach the attachements anyway:

** Attachment added: "kern.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/790435/+attachment/2164438/+files/kern.log

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https://bugs.launchpad.net/bugs/790435

Title:
  Adjusting brightness is impossible

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