Problem adjusting brightness in Gateway NE56R on Ubuntu 12.04


I am writing this post for a record. Somebody facing this problem should not spend too much time going through forums and multiple suggestions.

Problem Brightness does not change
System Gateway NE56R (might be applicable to HP DV6, Acer Aspire, Dell Inspiron, Toshiba)
OS Ubuntu 12.04 LTS
Solution change a detail in the grub config file

Here is the procedure using terminal—

  • Access termial by pressing CTRL-ALT-T
  • open the grub config file.
sudo gedit /etc/default/grub
  • Observe these two lines.
  • Either comment them out or replace them by the following line.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
  • Update grub
 sudo update-grub
  • Restart the system and observe that brightness can be changed.

09 Feb 2014 18:25

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