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Toshiba Nvidia LCD Brightness Fix
After installing Linux Mint 13 on the laptop, a Toshiba P500 I found the X server wouldnt reduce or increase brightness with the keyboard keys. After trying many a fix found around and nothing worked however I finally have a fix. If you have the same problem try the following
Open a console and run the following commands
Scroll down and find the line that will be similiar or exactly like:
GRUB_CMDLINE_LINUX_DEFAULT= "quiet splash"
now modify the line and add the parameter acpi_osi=, so the line should now read
Save and exit the text editor, and run the following command to update grub
To test the settings reboot
Upon relogging back in test your hardware keys, and your brightness should chage like they always did