Can confirm that I am having the same issue with a fresh installation of Ubuntu 18.04.3 running kernel version 5.3.0-53.
As far as hardware, I am using: - AMD Ryzen 3200G with Radeon Vega 8 Graphics - ASUS ROG Strix B450-F Motherboard I've been looking into this issue for a few days now. I've found that the problem only occurs when using the integrated graphics, as everything worked flawlessly when I installed a separate graphics card. Also, adding the "nomodeset" boot parameter did fix both the power off and reboot issues, but consequently it forced the OS to lock the displays at an awful screen resolution. -- 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
