I confirm the same issue with kernel 5.3.0-53-generic #47~18.04.1 Using Ubuntu 18.04.4 on a Lenovo IdeaPad-S540-14API
CPU0: AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx (family: 0x17, model: 0x18, stepping: 0x1) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880041 Title: Failing to shutdown/power off or reboot on AMD Ryzen CPUs on kernel versions 5.3.0-52 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-meta-hwe/+bug/1880041/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs