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
- Restart the system and observe that brightness can be changed.
— 09 Feb 2014 18:25