12.04 - How to control Brightness - Ask Ubuntu


i didn't install myself, ubuntu 12.04 lts on acer 4741g.

i use fn+left/right change brightness, failed.

how can control brightness levels?

try this:

  1. open terminal (ctrl + alt + t).
  2. then type sudo nano /etc/default/grub. ask password. type in.
  3. around 11th line, there like: grub_cmdline_linux_default="quiet splash". change grub_cmdline_linux_default="quiet splash acpi_backlight=vendor"
  4. save file ctrl+o followed ctrl+x. run sudo update-grub in terminal.
  5. reboot , see if backlight adjustment works. if not, undo changes did above, invoking text editor in steps 1 , 2.

hope helps.

works acer aspire v3-571,acer aspire v3 571g,hewlett packard bell easynote ts,acer aspire 4755g,acer aspire 5750-6866, acer aspire 5739, lenovo t540p


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