marcove wrote:Try this:
1. Open up your terminal
2. Copy and paste the following code into the terminal, and press enter:
sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
3. Enter your password when prompted and press enter again.
4. Now copy and paste the following code into the terminal, and press enter again:
5. You're done. Now close the terminal, and re-boot your computer.
Courtesy of Carl Duff
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