4.15.0-12 had the same problem, please see #1756455 [1] (which is absolutely the same as this one).
I have also tried all mainline kernels from 4.15.3 up to 4.17rc1, and here are the results: * all mainline kernels in branch 4.15 do NOT have any issues * starting with mainline 4.16.0 it is impossible to shut down (reboots instead) * Ubuntu kernel 4.15.0-12 HAS this problem So this regression was introduced in Ubuntu kernel 4.15.0-12, and in mainline kernel 4.16 1. https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1756455 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1760110 Title: Kernel 4.15.0-13.14 reboots instead of powering off (when on battery) on HP Spectre x360 ae-000x To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1760110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
