After upgrade from 13.04 to 13.10 Brightness is not working. Please let me know how to fix this issue,
Machine configurations given below.
id: thinkpad
description: Notebook
product: 0301G8G ()
vendor: LENOVO
version: ThinkPad Edge
serial: LR236W5
architecture: 64 bits
Have you tried this:
Open terminal ( Ctrl+Alt+T ) and type:
sudo cp /etc/default/grub /etc/default/grub.bak
sudo gedit /etc/default/grub
You will find this line in the new opened window: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Change it to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Save and close the window and type this in the terminal:
sudo update-grub
Restart your system..
if above procedure doesn't work then repeat the same step but this time try to change the above mentioned line with:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"
Note: The next line to the line mentioned above should be GRUB_CMDLINE_LINUX="" not GRUB_CMDLINE_LINUX="acpi_osi=Linux"
