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Thread: Brightness/contrast adjustment

  1. #1
    Join Date
    Jun 2011
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    54

    Brightness/contrast adjustment

    Hi, i have a aspire as5750 which is running the intel hd 3000 graphics. Ubuntu 11.10.

    I have tried using the function keys and the screen settings in ubuntu. When i use the function keys a little dial shows up and it seems to be adjusting on the dial but it isn't changing my screen brightness. Same with the dial in ubuntu settings.

    I have tried searching this forum and elsewhere but it's hard to know what to do still. Because i'm not sure what posts were only relevant to the specific laptop/ubuntu version/graphics they were using.

    But really the screen is too bright even for general use at normal angles. if i tilt the screen back far the colours look much better. But also i want this so i can save power as well.

    Also in the colour settings i can't change anything because it is un-calibrated. "The measuring instrument is not detected please check it is turned on and properly detected."
    Last edited by Spae; March 4th, 2012 at 12:58 AM.

  2. #2
    Join Date
    Feb 2008
    Beans
    4,242
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Brightness/contrast adjustment

    Have you run System Settings/Displays? I think there is a slider for brightness. However, it has no effect on some computers.

  3. #3
    Join Date
    Jun 2011
    Beans
    54

    Re: Brightness/contrast adjustment

    Yes, it does nothing.

    In colour options it says un-calibrated because none of the default profiles work. I am wondering if i could set up one some how whether i would then be able to adjust the brightness.

  4. #4
    Join Date
    Mar 2012
    Beans
    13

    Re: Brightness/contrast adjustment

    Hi,

    I'm having the exact same problem on my HP dv6. I press the brightness hotkeys and a box does pop up moving the slider up and down but it makes no effect on the actual brightness. I'd really love to be able to lower the brightness a tad as I dont need it all the way up and i'd like to be able to save some battery.

    cheers

  5. #5
    Join Date
    Aug 2007
    Location
    Karma BC
    Beans
    1,215
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Brightness/contrast adjustment

    There is undoubtedly a proper solution for your respective laptops, and in the meantime you might be able to use xgamma to tone your screen down a little

    I believe the command is something like this:
    'xgamma -rgamma 1 -ggamma 1 -bgamma 1'
    and you adjust the brightness in increments of .1 ie:
    'xgamma -rgamma .9 -ggamma .9 -bgamma .9'
    or simplified
    xgamma -gamma .5
    or
    xgamma -gamma .25
    xgamma is adjutable to 3 decimal places.

    man xgamma
    http://linuxcommand.org/man_pages/xgamma1.html
    As I stated, it's not a real solution, though it might help until you find said solution
    Last edited by utnubuuser; March 4th, 2012 at 07:38 AM.
    Kipling - "if"

  6. #6
    Join Date
    Jun 2011
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    54

    Re: Brightness/contrast adjustment

    Mmm yeah that works somewhat. Having on .9 is definitely an improvement. Thanks.

    I hope maybe there will be a fix for this is an update.

  7. #7
    Join Date
    Jun 2006
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    Hidden!

    Re: Brightness/contrast adjustment

    I use xbacklight and dim the display with a command

    xbacklight -set 40

    (or 20 or 60 or whatever). Works great.

  8. #8
    Join Date
    Jun 2011
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    54

    Re: Brightness/contrast adjustment

    ^that didn't work. Probably the same reason everything else didn't.
    Last edited by Spae; March 5th, 2012 at 12:59 AM.

  9. #9
    Join Date
    Mar 2012
    Beans
    13

    Re: Brightness/contrast adjustment

    That didn't work for me either I'd really love to fix this since I need to maximize my battery life for school.

  10. #10
    Join Date
    Apr 2008
    Location
    Depends
    Beans
    83
    Distro
    Xubuntu 13.04 Raring Ringtail

    Re: Brightness/contrast adjustment

    Hi, Not planning to hijack this thread.. but am having similar problem..my issue is well documented here:
    http://www.backtrack-linux.org/forum...ad.php?t=48392

    xbacklight returns No outputs have backlight property


    any solution please..
    Xbuntu 13.04, 64bit, HP ProBook 4520s, 8GB RAM 500GB HDD

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