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Thread: Aspire One screen not bright enough in Xubuntu

  1. #1
    Join Date
    Jul 2008
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    75

    Aspire One screen not bright enough in Xubuntu

    I'm running Xubuntu 10.04 on my Acer Aspire One D257 and even at full brightness, its not as bright as it should be. It's really making my eyes hurt when my surroundings are bright like when the lights are on in the room, or when it's daytime. My screen can get brighter then the max Xubuntu can do, as I've had windows on here and it gets much more brighter then Xubuntu.

    Is there anyway to fix this? Just so people know, I have tried going through the power settings and theres nothing in there that helps, and yes i've tried the Fn+Left or Right keys (the keys for changing brightness), they work but like I said, the max Xubuntu imposes is half the brightness that I can get in Windows.

  2. #2
    Join Date
    Jul 2011
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    1

    Re: Aspire One screen not bright enough in Xubuntu

    Quote Originally Posted by NekoMaster View Post
    I'm running Xubuntu 10.04 on my Acer Aspire One D257 and even at full brightness, its not as bright as it should be. It's really making my eyes hurt when my surroundings are bright like when the lights are on in the room, or when it's daytime. My screen can get brighter then the max Xubuntu can do, as I've had windows on here and it gets much more brighter then Xubuntu.

    Is there anyway to fix this? Just so people know, I have tried going through the power settings and theres nothing in there that helps, and yes i've tried the Fn+Left or Right keys (the keys for changing brightness), they work but like I said, the max Xubuntu imposes is half the brightness that I can get in Windows.
    I observe the same problem on my Aspire One D257, running Ubuntu 12.04. Despite the Ubuntu brightness being all the way up, the screen backlight is obviously not at it's known potential. Here are some values from /sys/class/backlight/acpi_video0 when the brightness is all the way up:


    root@scott-aspire:/sys/class/backlight/acpi_video0# cat brightness
    9
    root@scott-aspire:/sys/class/backlight/acpi_video0# cat max_brightness
    9
    root@scott-aspire:/sys/class/backlight/acpi_video0# cat actual_brightness
    9
    root@scott-aspire:/sys/class/backlight/acpi_video0# cat bl_power
    0
    root@scott-aspire:/sys/class/backlight/acpi_video0#

  3. #3
    Join Date
    Jul 2005
    Beans
    87

    Re: Aspire One screen not bright enough in Xubuntu

    I had this problem on a Acer Aspire One Happy 2 (identical with D257, except the case color) with Ubuntu 12.04. It appeared right after I installed Jupiter. Fortunately, in my case it solved itself after another reboot.

  4. #4
    Join Date
    Jun 2006
    Beans
    15

    Re: Aspire One screen not bright enough in Xubuntu

    Same problem here. My laptop is an Asus 1005-P (netbook).
    Régis B. -- MinuteButterfly.de

  5. #5
    Join Date
    Jun 2006
    Beans
    15

    Re: Aspire One screen not bright enough in Xubuntu

    I managed to solve this problem by adding an option to grub: edit the /etc/default/grub file and add "acpi_backlight=vendor" to the GRUB_CMDLINE_LINUX_DEFAULT option. On my computer, the option now looks like this:
    Code:
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
    Then I rebooted grub:
    Code:
    sudo update-grub
    Then I rebooted. Brightness was back to normal.
    Régis B. -- MinuteButterfly.de

  6. #6
    Join Date
    Nov 2005
    Beans
    12

    Re: Aspire One screen not bright enough in Xubuntu

    Same problem here with an Asus eee on xubuntu 12.04. Maximum screen / desktop brightnees needed a boost. proposed solution worked like a charm.
    Thanks!

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