I'm have brightness button problem too. It's not detect by xen programm. And of course no pop up in gnome then change brightness. Laptop Asus A6vm. In oldest version asus module this button work fine. About 3 years ago. But after change kernel module this key was lost.
I'm have brightness button problem too. It's not detect by xen programm. And of course no pop up in gnome then change brightness. Laptop Asus A6vm. In oldest version asus module this button work fine. About 3 years ago. But after change kernel module this key was lost.