I too have this problem, My config Asus ZenBook Prime UX-31A, and USB modems are Huawei E372 and an old Qualcomm Icon 7.2, both modems have problems switching unless already plugged in at boot time.
What kinf of information (logs or other) can I give you to help solving this bug ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/979697 Title: Modeswitching modem not working in USB 3.0 port To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/979697/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs