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Thread: Screen brightness on Acer 4810T

  1. #1
    Join Date
    Jul 2009
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    Screen brightness on Acer 4810T

    Hi.

    I've just installed Ubuntu 9.04 on my Acer Aspire 4810Timeline. Everything seems to be working ok, except for the screen brightness. The [Fn]+[Up]/[Down] combination displays the popup and the bar is moving correctly, but the brightness remains the same. I've checked the contents of /proc/acpi/video/OVGA/DD02/brightness which changes accordingly. Anyone who's had the same problem, and knows how to solve it?

  2. #2
    Join Date
    Jul 2009
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    Geneva, Switzerland
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    21
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    Ubuntu 10.04 Lucid Lynx

    Re: Screen brightness on Acer 4810T

    Just run this in a terminal, it worked for me on my Acer Timeline 4810TZ-4011 on Linux Mint (which is based on Ubuntu 9.04)
    Code:
    xrandr --output LVDS --set BACKLIGHT_CONTROL native
    I found it here, the advice was given by alvinator@

    Hope it'll work for you
    Last edited by OrnithO; July 25th, 2009 at 02:22 AM. Reason: small copy/paste mistake

  3. #3
    Join Date
    Feb 2007
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    71
    Distro
    Ubuntu 9.10 Karmic Koala

    Re: Screen brightness on Acer 4810T

    This fix works. thanks. But it resets when I restart my laptop. Can I make this change permanent?

  4. #4
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    Ubuntu 10.04 Lucid Lynx

    Re: Screen brightness on Acer 4810T

    Sorry, I forgot that...
    You have to go to System > Preferences > Startup Application Preferences.
    Then Click on add. For the name, call it Screen Brightness (or anything you want) and put the code under command. The restart and check if it worked.
    Hope you will find your way through. My Ubuntu is in French and I don't know the correct name in English...

  5. #5
    Join Date
    Dec 2006
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    Mexico D.F.
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    Distro
    Ubuntu 13.10 Saucy Salamander

    Re: Screen brightness on Acer 4810T

    Hi.

    I have a similar problem with (kind of) the same computer. The exact model is 4810TZ-4013

    Running the command does nothing, I'm still unable to change the brighntess

    Any ideas? This thing is starting to hurt my eyes

    Thanks in advance
    Last edited by edd07; August 28th, 2009 at 03:47 AM. Reason: turns out it did nothing

  6. #6
    Join Date
    Feb 2007
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    Portugal
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    277
    Distro
    Ubuntu Development Release

    Re: Screen brightness on Acer 4810T

    I updated the BIOS to 2.28, logged into Ubuntu, changed the screen brightness... and it worked!

    Well, the bad news is every time I do that, the system locks up =X

    EDIT: bricked it trying to downgrade the BIOS, got it back, still no backlight control too, but this time I won't update the BIOS
    Last edited by Arlanthir; September 29th, 2009 at 06:58 PM.

  7. #7
    Join Date
    Apr 2006
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by OrnithO View Post
    Just run this in a terminal, it worked for me on my Acer Timeline 4810TZ-4011 on Linux Mint (which is based on Ubuntu 9.04)
    Code:
    xrandr --output LVDS --set BACKLIGHT_CONTROL native
    I found it here, the advice was given by alvinator@

    Hope it'll work for you
    Found a workaround for the 5810T on karmic that will persist across reboots:

    Add the following to the GRUB_CMD_LINUX_DEFAULT entry in /etc/default/grub: acpi_backlight=vendor

    Don't forget to run update-grub.
    Last edited by coolvibe; September 30th, 2009 at 04:04 PM.

  8. #8
    Join Date
    Dec 2006
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    Mexico D.F.
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    116
    Distro
    Ubuntu 13.10 Saucy Salamander

    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by coolvibe View Post
    Found a workaround for the 5810T on karmic that will persist across reboots:

    Add the following to the GRUB_CMD_LINUX_DEFAULT entry in /etc/default/grub: acpi_backlight=vendor

    Don't forget to run update-grub.
    Uh-oh, I've just installed Karmic, but I don't have a /etc/default/grub file.

    Any ideas?

  9. #9
    Join Date
    Apr 2006
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    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by edd07 View Post
    Uh-oh, I've just installed Karmic, but I don't have a /etc/default/grub file.

    Any ideas?
    If you upgraded, you are still using the old GRUB. Just add them to your kopts in the menu.lst in /boot/grub, (don't forget to run update-grub afterwards) or just upgrade to GRUB 2

    EDIT: Oh, and KMS might be in the way as well, as it will map your screen to LVDS1 instead of LVDS, so desable that too. You can disable KMS by setting "nomodeset" as a kernel parameter.
    Last edited by coolvibe; October 5th, 2009 at 07:40 PM.

  10. #10
    Join Date
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    Ubuntu 13.10 Saucy Salamander

    Re: Screen brightness on Acer 4810T

    Quote Originally Posted by coolvibe View Post
    If you upgraded, you are still using the old GRUB. Just add them to your kopts in the menu.lst in /boot/grub, (don't forget to run update-grub afterwards) or just upgrade to GRUB 2

    EDIT: Oh, and KMS might be in the way as well, as it will map your screen to LVDS1 instead of LVDS, so desable that too. You can disable KMS by setting "nomodeset" as a kernel parameter.
    Ok, I tried to upgrade GRUB and it didn't work (it booted me into a grey screen with a black rectangle on the center of the screen), so I added the option to old-school grub's menu.lst.

    So, you're saying KMS will break this solution? Or will I have to do something else when it's enabled?

    EDIT: Nevermind, it doesn't work. Seems like my laptop is trying really hard to blind me
    Last edited by edd07; October 6th, 2009 at 01:55 AM.

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