You have been subscribed to a public bug:
When booting up Ubuntu 18.04 with a kernel version of 5.3.0-52 or later
(including 5.3.0-53), everything seems to be working as usual. However,
when I shutdown, the system will only soft shutdown, with the CPU still
running at full power, forcing me to hold down the power button to fully
power off affected systems. If I reboot, it will cause the system to
hang and not respond. Either way, a hard reset or poweroff will be
required, and this is not an option for systems being remotely accessed.
It is not possible for me to collect kernel logs at this point, unless
something wrong is happening in those kernel versions before the actual
shutdown.
It is possible that this may also occur on Ubuntu 20.04 with kernel
versions 5.4.0-29 and later, but I have not yet tested this out. This
problem is occurring on both my desktop and laptop computers which
respectively are:
* AsRock B450 Pro4 with AMD Ryzen 3 3200G APU
* Lenovo ThinkPad A485 with AMD Ryzen 5 Pro 2500U mobile APU
In the meantime, I am stuck on kernel version 5.3.0-51, as that is the
last working 5.3.x kernel version offered in the standard Ubuntu
repositories that doesn't have this problem, without me having to use
PPAs. I don't know if this problem also occurs on systems with Intel
CPUs, as I don't own any recently-made system (last 3 years from 2017)
with such CPUs to test if this problem occurs on them.
** Affects: dri
Importance: Unknown
Status: Unknown
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Affects: linux-meta-hwe (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-collected bionic ubuntu
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Failing to shutdown/power off or reboot on AMD Ryzen CPUs on kernel versions
5.3.0-52 and later
https://bugs.launchpad.net/bugs/1880041
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