Problem adjusting brightness in Gateway NE56R on Ubuntu 12.04
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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.
GRUB_CMDLINE_LINUX_DEFAULT="quite_splice"
GRUB_CMDLINE_LINUX_DEFAULT=""
- 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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