brightnessxcalibxorgxrandr
I'm trying to adjust contrast on my laptop, a ThinkPad E430, running ubuntu 12.04:
xcalib -co 70 -a
xrandr --output LVDS1 --brightness 0.7
Either of them works only for 1-2 seconds and after that contrast drops to its normal setting by Ubuntu. What should I do to prevent this action?
I am not familiar with your particular model, but you can try some of these 'solutions'.
Add acpi_backlight=vendor to grub:
Open terminal (Ctrl+Alt+T) and type:
gksudo gedit /etc/default/grub
You will find this line in the new opened window:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Change it to:
Example:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Note your entry may be different - only add the acpi_backlight=vendor.
After doing that, do:
sudo update-grub
If that does not get the Fn+F6 and Fn+F7 keys working, you can do this via the system settings as seen below:
Best Answer
This is a workaround that achieves the same goal: