The brightness keys on my Dell N4010 with Ubuntu 12.04 is causing ubuntu to freeze on a black screen if i press the BrightUp and BrightDown key(s) 3-4 times. I think this is a bug which was noticed in 10.04 and was patched, but its giving problem in 12.04 again to me. I tried remapping and disabling the brightness keys but it did not work out. Please help.
Edit "/etc/default/grub" as root.
Now, look for the line that looks like:
Append "acpi_backlight=vendor acpi_osi=Linux" to the end of that line, before the end quotes, so that the line now looks something like this:
Save and close the file, and run the following command:
Now, reboot, and test out the brightness keys. They should be working correctly now.
I've managed to get this bug solved!
The answer is here: http://ubuntuforums.org/showthread.php?t=2181534&p=12819813#post12819813
Create the file /usr/share/X11/xorg.conf.d/20-intel.conf with the following content:
Log out to see if it works.
protected by Community♦ Jan 17 '14 at 16:11
Thank you for your interest in this question. Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?