If I start with Ubuntu 16.04, and upgrade the kernel to 4.7.1 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7.1/, then simple-scan still works. But if I upgrade the kernel to 4.8-rc1 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8-rc1/ then it locks up.
If I start with Ubuntu 16.04, and upgrade the kernel to 4.7.1 from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.7.1/, then simple-scan still works. But if I upgrade the kernel to 4.8-rc1 from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v4.8-rc1/ then it locks up.