6

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.

3

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?

5

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

  • This also works for later Ubuntu. Thank you very much, I've been looking for this solution for ages. – wump Mar 11 '12 at 19:17
1

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

Add to kernel command line:

acpi_backlight=vendor

And you are done!

0

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

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