Home / ubuntu / Questions / 9047
Accepted
Wilsonzaizai
Asked: 2010-10-24 03:21:01 +0800 CST

Can't adjust brightness on my laptop

  • 772

I'm having difficulty in adjusting brightness on my Acer Aspire 4740:

  • Screen 14.1-inch glossy LED-backlit, 1366x768 res
  • CPU Intel Core i5-430M 2.26-GHz
  • RAM 1GB DDR3
  • HDD 320GB
  • Graphics Intel GMA HD

Im using Ubuntu 10.10 . I do not have this problem in Ubuntu 10.04 , but this problem occur in Ubuntu 10.10 . I can't decrease or increase my brightness even in Compiz.

10.10 brightness acer aspire

4 Answers

  1. Try this.

    1. Open the Terminal (Ctrl+Alt+T) and type:

      gksu gedit /etc/default/grub

    2. Change the line:

      GRUB_CMDLINE_LINUX=""

      To:

      GRUB_CMDLINE_LINUX="acpi_osi=Linux"

    3. Save the file and quit the text editor.

    4. Now in the terminal run:

      sudo update-grub

    5. Restart Ubuntu.

    Based very closely on this article: living in java

    • 5
  2. Best Answer

    I also have an ACER, but ASPIRE 4736Z. Same problem.

    xbacklight, xgamma doesn't work.

    Something that did work for me is redshift utility: Is there a software utility to adjust screen gamma/brightness/contrast?

    • 3

  3. https://bugs.launchpad.net/emgd/+bug/711172

    Add to kernel command line:

    acpi_backlight=vendor

    And you are done!

    • 1

  4. Have you tried using Xbacklight? http://linux.die.net/man/1/xbacklight

    • 0