Comment 649 for bug 1690085

I have revisited the errata. Errata 1033 "A Lock Operation May Cause the System to Hang" and 1109 "MWAIT Instruction May Hang a Thread" are the top contenders. According to page 12 and 13 of that document, Pinnacle Ridge processors are not affected. However, page 16 and 17 suggest 2nd Gen Ryzen are affected. This makes me conclude: either there is an error in the document, or Raven Ridge aka improved Zen 1 (Desktop and Mobile) are affected, while Pinnacle Ridge is not.

During my latest tests on kernel 5.0.1, on AGESA 1006 and after upgrading to AGESA 0070, I wasn't able to reproduce any freezes / hangs on a Ryzen 7 2700, ASUS A320M-K (BIOS defaults, no OC, no Typical Current Idle setting), 16GB Patriot Viper RGB 3200CL16, ASUS RX480 8GB and Corsair AX860 (Haswell C6/C7 support, 80 PLUS Platinum).

I installed a fresh, bare minimum, default Arch Linux install w/o any special configuration, let the system sit in idle for half a day and check log for hangs. Then, I enabled all power management features using powertop and let the system sit over night, still no hangs. I repeated the same for AGESA 0070, still no hangs.

I think it's too early to conclude anything, as the hangs / freezes used to be very random. I will repeat my tests (on AGESA 0070) with a slightly more bloated system by installing GNOME.