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I have an acer aspire 5745dg laptop and i have also a very serious problem!!

My brightness is always at maximun and I cannot change it with the fn keys or from the power management and my battery discharging fast:/.

Thats my problem and i need your help guys!!!!In my windows partition brightness works perfectly only in ubuntu I have this serious and annoying problem!!!!Please reply to my message i'd appreciate that!

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closed as too localized by James Dec 26 '12 at 0:54

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Hi, welcome to AU. Can you change the brightness from the "Screen" setting application? Search "bright" in the dash. – Jjed Apr 27 '12 at 0:35
This question appears to be abandoned, if you are experiencing a similar issue please ask a new question with details pertaining to your problem. If you feel this question is not abandoned, please flag the question explaining that. :) – Seth Dec 26 '12 at 0:47

I also own a Acer netbook. I use

sudo setpci -s 00:02.0 F4.B=XX

where XX is your brightness level.

XX = FF for max brightness
XX = 30 my setting
XX = 00 no brightness
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Try this:


  1. Open the grub configuration file.

    gksudo gedit /etc/default/grub
  2. Find this line GRUB_CMDLINE_LINUX="" and change it to:

  3. Save the file and close the text editor.

  4. Update Grub.

    sudo update-grub
  5. Restart your computer and try to change the brightness.

Similar Question

"Can't Adjust Brightness on My Laptop"

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i tried it but nothnig happened anything else?:/ – pete-maister Apr 26 '12 at 20:48
I would look at the link I posted labeled "Can't adjust brightness on my laptop" and try the other things there. They had an Acer too. – jamesadney Apr 26 '12 at 21:10

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