I have random freezes with Ryzen 2200u laptop. Display image just
freezes and system stops responding. Only way to get out from this state
is to holding power button (even magic SysRq key does not work). No any
clues in logs.

With Ubuntu 18.04 it was happen nearly once per week (not intense use).
After installing 18.10 things become more stable - I've got first lockup
after 6 weeks and another after 3. Hangs are completely random and on
different cpu load - once I've got this while gaming (and ambient noise
continue playing...)

I've tried idle=nomwait but this did not help on 18.04 - and line
"monitor-mwait will be used for idle loop" was still present in dmesg
with this parameter!

idle=halt parameter completely disables mwait instruction in kernel and
also forces use of only C1 state. In my laptop it does not cause higher
battery drain or any suspend-resume issues. But I've not tested it
completely an used it for few days... So this may be even not the
solution for my problem.

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https://bugs.launchpad.net/bugs/1690085

Title:
  Ryzen 1800X freeze - rcu_sched detected stalls on CPUs/tasks

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