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I am using Ubuntu 12.10. Whenever I restart my Laptop my system brightness is changing.What settings should I make so that brightness doesn't change on every restart

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What is the manufacturer and model of your laptop? – cprofitt Nov 16 '12 at 12:49
  1. Run this command:

    gksu gedit /etc/default/grub
  2. Change the line GRUB_CMDLINE_LINUX="" into GRUB_CMDLINE_LINUX="acpi_osi=Linux".

    Save the file and quit the text editor.

  3. Then run: sudo update-grub

  4. Restart.

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Thank You @Vishnu – Madhu Prudhvi Raj Nov 16 '12 at 13:03
Ist It Worked For You? – Vishnu Praneeth Reddy Nov 16 '12 at 13:06

this link worked for me..i am using pavillion dv6 ubuntu 12.10

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Thanks for your answer, but can you explain and quote the necessary steps from the link? The linked source might be down someday. – mrcktz Nov 19 '12 at 21:21

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