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Thread: Can't adjust brightness on Acer Aspire 5738 running Karmic

  1. #1
    Join Date
    Aug 2009
    Location
    Valdivia, Chile
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    153
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    Ubuntu 10.10 Maverick Meerkat

    Red face Can't adjust brightness on Acer Aspire 5738 running Karmic

    Can't adjust brightness on Acer Aspire 5738 running Karmic. The same happened under Jaunty. The screen never seems to reach its full brightness and it flickers.

    The notify osd shows a bright bar indicating the screen brightness increasing or decreasing when I use the fn key + the corresponding keys for increasing or reducing the screen brightness, but the screen always stays the same.

    I can move the arrow in the brightness applet in the Gnome panel up and down, but nothing happens, either.

    I think I'll report a bug.

  2. #2
    Join Date
    Feb 2010
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    1

    Cool Re: Can't adjust brightness on Acer Aspire 5738 running Karmic

    I too still have the same problem.
    Acer Aspire 5738.

    Ubuntu 9.10.

    possible options I saw were:

    a) CompizFusion: Download and enable the Brightness/Contrast etc option. Use it for specific windows (you can make firefox glow alone) or add a class (nautilus) etc.
    Keyboard shortcuts like ALT/CTRL/SUPER/SHIFT + Left/Right

    b) echo 4 > /sys/devices/virtual/backlight/acpi_video0/brightness
    Didn't work yet. I think I need to logout and get back to make changes.
    [values from 1-8. 4 is mid range for many laptops]

    c) If the above works fine you can make a two scripts.. for gradually decreasing/increasing the backlight value.. using above.

    Hey if you get anything// then do post back.

    PS: either (b) or System >> Preferences >> Power Management >> "Set display Brightness to" lets you set the brightness (uses the same file). but only When you restart system, the changes show [killing the x-server alone may not help]
    Last edited by mrdigerati; February 15th, 2010 at 10:43 PM. Reason: Nayi Khoj

  3. #3
    Join Date
    Nov 2008
    Location
    São Paulo - Brasil
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    39
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Can't adjust brightness on Acer Aspire 5738 running Karmic


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