Comment 550 for bug 1690085

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.