I had the same problem since 4.9.0-4-amd64
Recently I updated the kernel to version 4.14.0-3-amd64 and now everything works as it should.
ASUS UX305UA laptop
Icon name: computer-laptop Chassis: laptop Operating System: Debian GNU/Linux 9 (stretch) Kernel: Linux 4.14.0-3-amd64 Architecture: x86-64
I had the same problem since 4.9.0-4-amd64
Recently I updated the kernel to version 4.14.0-3-amd64 and now everything works as it should.
ASUS UX305UA laptop
Icon name: computer-laptop
Chassis: laptop
Operating System: Debian GNU/Linux 9 (stretch)
Kernel: Linux 4.14.0-3-amd64
Architecture: x86-64