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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1726930 Title: System fails to start (boot) on battery due to read-only root file- system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/laptop-mode-tools/+bug/1726930/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs