Debian - slow brightness responce on Dell laptop fix

On some Dell laptops with gnome3 brightness change takes veeeery long (seconds) and system is choppy in the meantime.

A workaround has been posted on and is to:

  1. add acpi_backlight=vendor to GRUB_CMDLINE_LINUX_DEFAULT option in /etc/default/grub file (eg. GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_backlight=vendor")
  2. run $ sudo update-grub

Bug for ubuntu is filed:

Worked on my Dell e6430.