Fix Lenovo T440s brightness keys

Per default the brightness keys does not work and we couldn't even read out the keycodes using xev.

We found the fix on launchpad:

  1. Edit /etc/default/grub
  2. Change the line starting with GRUB_CMDLINE_LINUX_DEFAULT= to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
  3. sudo update-grub
  4. Reboot
The author

Written by Per

Free software enthusiast and transhumanist residing in Stuttgart, Germany.

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