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Thread: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

  1. #1
    Join Date
    Nov 2010
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    6

    Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    My problem is that I can't change the brightness level of my laptop screen. I tryed to change it with the Fn key combination of my keyboard, and Ubuntu shows its brightness bar moving up and down, but the screen doesn't change the brightness.

    I tryed with some scripts that I found at Google (that's one of that links http://ubuntuforums.org/showthread.php?t=1446943), but nothing works... Neither xbacklight nor backlight scripts.

    Can someone help me with this problem?

    (Sorry if there are some mistakes, my English is not very good...)

  2. #2
    Join Date
    May 2010
    Location
    Northern California
    Beans
    33
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    Here is the solution that worked on my Aspire 5740; In the terminal, run:

    sudo gedit /etc/default/grub

    when the file opens, look for the line similar to:

    GRUB_CMDLINE_LINUX_DEFAULT="quite splash"

    and add "acpi_osi=" to the list, without the quotes, so it looks like:

    GRUB_CMDLINE_LINUX_DEFAULT="quite splash acpi_osi="

    save the file, then exit gedit. Next, be sure to run:

    sudo update-grub

    to make the changes permanent. Exit the terminal and reboot.

  3. #3
    Join Date
    Nov 2010
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    6

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    ****... Thanks! It worked I owe you one diver!

  4. #4
    Join Date
    May 2010
    Location
    Northern California
    Beans
    33
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    Glad it worked for you!

  5. #5
    Join Date
    Feb 2008
    Beans
    2

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    Worked for me too on 10.04 - had been bugging me for ages. Thanks so much!

  6. #6
    Join Date
    Jun 2006
    Location
    Washington, DC
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    27
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    Just wanted to say that this worked for my Acer 5742z. Brightness notifications are gone now, but I'd rather have the functionality than the bling.
    Rowan Q

    Ubuntu 10.10

  7. #7
    Join Date
    Jul 2006
    Beans
    4

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    Also works for me on my Acer Aspire 5742Z, also without notifications. Unfortunately, power control doesn't work either, so no automatic dimming when switching to battery or when running on battery and idle.

    I opened a Launchpad bug ticket, but no response so far.

    https://bugs.launchpad.net/ubuntu/+s...ux/+bug/693942

  8. #8
    Join Date
    Jun 2006
    Location
    Washington, DC
    Beans
    27
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    Quote Originally Posted by 787b View Post
    Also works for me on my Acer Aspire 5742Z, also without notifications. Unfortunately, power control doesn't work either, so no automatic dimming when switching to battery or when running on battery and idle.

    I opened a Launchpad bug ticket, but no response so far.

    https://bugs.launchpad.net/ubuntu/+s...ux/+bug/693942
    I found a program call Jupiter. I think it's in the repo but here's a link:

    http://sourceforge.net/projects/jupiter/files/

    It detects whether you're on battery or A/C and brightness, CPU and other settings to maximize performance or power saving.
    Rowan Q

    Ubuntu 10.10

  9. #9
    Join Date
    Jul 2011
    Beans
    2

    Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    thanx a lot. your solution is really helpful.

    Quote Originally Posted by divergex View Post
    Here is the solution that worked on my Aspire 5740; In the terminal, run:

    sudo gedit /etc/default/grub

    when the file opens, look for the line similar to:

    GRUB_CMDLINE_LINUX_DEFAULT="quite splash"

    and add "acpi_osi=" to the list, without the quotes, so it looks like:

    GRUB_CMDLINE_LINUX_DEFAULT="quite splash acpi_osi="

    save the file, then exit gedit. Next, be sure to run:

    sudo update-grub

    to make the changes permanent. Exit the terminal and reboot.

  10. #10
    Join Date
    Jul 2011
    Beans
    5

    Thumbs down Re: Screen's Brightness level bug on Acer Travelmate 5740 with Ubuntu 10.10

    thanks guys.it also works for me on my travelmate 5740!

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