Yes, I have problem with it too. My temporary solution is:
sudo setpci -s 00:02.0 F4.B=xx
where 00:02.0 is my device (maybe works for you too) and xx is value in hex from 0 to ff - it works fine for me
I am create short script for console and for gui too, and create alias to ~/.bashrc for run that script. For now it is fastest changing brightness on my HP ProBook 4510s
Yes, I have problem with it too. My temporary solution is:
sudo setpci -s 00:02.0 F4.B=xx
where 00:02.0 is my device (maybe works for you too) and xx is value in hex from 0 to ff - it works fine for me
I am create short script for console and for gui too, and create alias to ~/.bashrc for run that script. For now it is fastest changing brightness on my HP ProBook 4510s