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mahammad/brightness.md

Last active August 29, 2015 14:14
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packard bell brightness not work ubuntu 14.04
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brightness.md
  • gksudo vi /etc/default/grub
1. way
Change to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
2. way
Locate   : GRUB_CMDLINE_LINUX=""
Change to: GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"

Then again in your terminal:

  • sudo update-grub
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mahammad commented Feb 9, 2015 

Open a terminal (Ctrl + Alt + T).
Then type sudo nano /etc/default/grub. It will ask for your password. Type it in.
Around the 11th line, there will be something like: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash". Change it to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Save the file by Ctrl+O followed by Ctrl+X. Then run sudo update-grub in the terminal.
Reboot and see if backlight adjustment works. If not, undo the changes you did above, by invoking the text editor as in steps 1 and 2.

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