You have 2 backlight interfaces: intel_backlight and sony. This is the problem.
First, lets see which one is the active one. Run the following commands and tell me which ones make a change to the brightness:
Code:
echo 2441 | sudo tee /sys/class/backlight/intel_backlight/brightness
echo 3882 | sudo tee /sys/class/backlight/intel_backlight/brightness
echo 4882 | sudo tee /sys/class/backlight/intel_backlight/brightness
Code:
echo 3 | sudo tee /sys/class/backlight/sony/brightness
echo 5 | sudo tee /sys/class/backlight/sony/brightness
echo 7 | sudo tee /sys/class/backlight/sony/brightness
If you have a look at this thread, I helped someone else with a Sony E series and we had to create a workaround to get the brightness to work. I think we may have to do the same for your computer.
We might as well get the key codes for your brightness keys now. Open a terminal window and type in the following command:
...then press the brightness up key combination followed by thee brightness down key combination. Post back the codes that are displayed in the terminal window.
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