I don't know what's going on. The 3500U and 3400G should be essentially the same silicon. I'm running Solus, which should have the latest kernel. Maybe try a d

I don't know what's going on. The 3500U and 3400G should be essentially the same silicon. I'm running Solus, which should have the latest kernel. Maybe try a different distro using a USB live distro just to see?