Same issue here: AMD® A12-9720p radeon r7 Ubuntu 20.04.3 LTS Kernels from 5.11.0-46 to 5.13.0-27 fail at shutdown, restart and suspend.
Only working kernel is 5.11.0-40
Same issue here:
AMD® A12-9720p radeon r7
Ubuntu 20.04.3 LTS
Kernels from 5.11.0-46 to 5.13.0-27 fail at shutdown, restart and suspend.
Only working kernel is 5.11.0-40