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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!

Jorge Castro
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pete-maister
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    Hi, welcome to AU. Can you change the brightness from the "Screen" setting application? Search "bright" in the dash. – Jjed Apr 27 '12 at 00:35
  • This question appears to be abandoned, if you are experiencing a similar issue please [ask a new question](http://askubuntu.com/questions/ask) 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 00:47

2 Answers2

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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
RanRag
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Try this:

(Source)

  1. Open the grub configuration file.

     gksudo gedit /etc/default/grub

  2. Find this line GRUB_CMDLINE_LINUX="" and change it to:

     GRUB_CMDLINE_LINUX="acpi_osi=Linux"

  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.

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