Comment 308 for bug 1690085

Blaming the PSU from AMD's part is wrong, since idle freezes have been documented with various PSUs, new and old. If you read my older posts, I did a complete replacement of parts between two systems: one excibiting the freeze on idle issue and one that didn't. The system not excibiting the freeze was using a really old (pre Hasswell) PSU. Putting this PSU on the other system didn't avoid idle freeze.

The problem is related to power and actually I have "hide" the problem by overclocking my CPU. Hitting certain voltages/frequencies avoids completely the issue (at least on my case with an ASUS X370 Prime). But even these voltages/frequencies are different from one case to another. Another user here reported he "hides" the problem by using the automatic overclocking of motherboard ("optimized mode for daily computing" option) which actually overclocks to 3600 if I remember well. For me this didn't work, still had idle freezes. But idle freezes disappeared when I overclocked at 3900.

rcu option doesn't fix the problem for all. It changes the way cores get idle so some see the problem as fixed, some don't. It is more than obvious that this is not a kernel problem. So I would close this report as invalid. It is not a kernel bug. It is a hardware issue that AMD needs to fix and it seems it has been fixed in with this new option "Power Supply Option". Unfortunately my motherboard doesn't have this option yet.