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Thread: Screen brightness on Acer 4810T

  1. #21
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by tijmz View Post
    I tried this on Karmic (on a 4810T) and got this:

    Code:
    tijmz@Eurydice:~$ xrandr --output LVDS --set BACKLIGHT_CONTROL native
    X Error of failed request:  BadRROutput (invalid Output parameter)
      Major opcode of failed request:  149 (RANDR)
      Minor opcode of failed request:  15 (RRGetOutputProperty)
      Serial number of failed request:  26
      Current serial number in output stream:  26
    Does anyone have any suggestions? I'd like to be able to change brightness settings
    Read the last page or so of comments, you have to add "nomodeset acpi_backlight=vendor" to the kernel line of GRUB2.

  2. #22
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    Re: Screen brightness on Acer 4810T

    Hi,

    When I try to edit the /etc/default/grub file and run "update-grub", I get this:

    Code:
    /etc/default/grub: 9: nomodeset acpi_backlight=vendor: not found
    I can't find anyone else who had this problem. Any ideas?

  3. #23
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by Vertumnus View Post
    Hi,

    When I try to edit the /etc/default/grub file and run "update-grub", I get this:

    Code:
    /etc/default/grub: 9: nomodeset acpi_backlight=vendor: not found
    I can't find anyone else who had this problem. Any ideas?
    It's probably a typo, let me give you an example of how it should look:

    Code:
    (...)
    GRUB_HIDDEN_TIMEOUT_QUIET=true
    GRUB_TIMEOUT="10"
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
    GRUB_CMDLINE_LINUX=""
    (...)
    Compare it with yours and post the results

  4. #24
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    Re: Screen brightness on Acer 4810T

    YESSSS!!! It works! Although for some reason, the Ubuntu "loading" icon that appears when I first turn my computer on is now stretched. I think I can put up with that though. Thanks!
    Last edited by Vertumnus; November 24th, 2009 at 04:11 PM.

  5. #25
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by Vertumnus View Post
    YESSSS!!! It works! Although for some reason, the Ubuntu "loading" icon that appears when I first turn my computer on is now stretched. I think I can put up with that though. Thanks!
    Good to know
    That's probably a side effect from the 'nomodeset' part. It turns off KMS so the boot get's uglier.

  6. #26
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by Arlanthir View Post
    It's probably a typo, let me give you an example of how it should look:

    Code:
    (...)
    GRUB_HIDDEN_TIMEOUT_QUIET=true
    GRUB_TIMEOUT="10"
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
    GRUB_CMDLINE_LINUX=""
    (...)
    Compare it with yours and post the results
    Hi

    Just tried all this with Kubuntu 9.10 4.3.4, but no joy. any ideas?
    Jim Hitch
    English Language Services Limited
    http://www.jimhitch.co.uk

  7. #27
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by jim.hitch View Post
    Hi

    Just tried all this with Kubuntu 9.10 4.3.4, but no joy. any ideas?
    Yes, it doesn't work for me as well on KDE, only on gnome.
    On KDE I have to use the script from https://help.ubuntu.com/community/AspireTimeline/Fixes

    The worst part is it needs root access, otherwise mapping it to the keys would be perfect...

  8. #28
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    Re: Screen brightness on Acer 4810T

    Shame.

    I think I tried the script before, but failed to get it to work. When I have time, I'll give it another go. Not very good with scripts, me, The only scripts I've done are simple bash scripts so far, and this looks more complex than that.

    I'll work it out.

    Jim
    Jim Hitch
    English Language Services Limited
    http://www.jimhitch.co.uk

  9. #29
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by jim.hitch View Post
    Shame.

    I think I tried the script before, but failed to get it to work. When I have time, I'll give it another go. Not very good with scripts, me, The only scripts I've done are simple bash scripts so far, and this looks more complex than that.

    I'll work it out.

    Jim
    You don't have to 'do' anything, just copy the contents to a .sh file, backlight.sh for instance.
    Then write on a terminal:

    chmod +x backlight.sh

    and then you just have to run it like so:

    backlight.sh down
    backlight.sh up


  10. #30
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    Re: Screen brightness on Acer 4810T

    It's my grub:
    GRUB_HIDDEN_TIMEOUT_QUIET=true
    GRUB_TIMEOUT=10
    GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor"
    GRUB_CMDLINE_LINUX=""
    I can't change blacklight brightness
    Help me
    I use Ubuntu 9.10 ,my laptop: ASPRIRE 4736Z

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