Ubuntu – Brightness keys no longer work

backlightbrightnessgrub2kernelthinkpad

My Fn+F8 and Fn+F9 keys to change the screen's brightness appear to no longer work on my Thinkpad laptop.

# ls /sys/class/backlight/
thinkpad_screen

Some guide told me to make this:

# cat /usr/share/X11/xorg.conf.d/20-intel.conf 
Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

And someone else said to do this:

# cat /usr/share/X11/xorg.conf.d/20-nvidia.conf 
Section "Device"
        Identifier "NVIDIA"
        Driver "nvidia"
        Option "NoLogo" "True"
        Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

This is my GRUB CMDLINE_LINUX_DEFAULT line, in case it's relevant: GRUB_CMDLINE_LINUX_DEFAULT="nosplash nomodeset acpi_osi=Linux acpi_backlight=vendor"

The Ubuntu wiki page on backlight issues says

Add just kernel parameters thinkpad-acpi.brightness_enable=1
acpi_backlight=vendor to /boot/grub/menu.lst . Execute: sudo update
grub

but I don't have a menu.lst and I suspect this is outdated.

Doing something like this does not work: echo 10 > /sys/class/backlight/thinkpad_screen/brightness

Any ideas?

Best Answer

Removing all kernel boot parameters and installing the ppa:xorg-edgers/ppa's nvidia drivers fixed the issue.

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