PBO option seems to be locked, try to enable it on bios and on Ryzen Master and after disable it.
Also Simultaneous multi-thread option on Ryzen Master.
SMT was never changed. I tried turning it on or off, and rebooting, but that didn't change anything. To be absolutely clear: before this problem started, I never once hit APPLY in Ryzen Master.
PBO = Precision Boost Overdrive? I certainly never enabled it. I made sure it was disabled in Ryzen Master. It was. There's no PBO option in my BIOS, and I didn't change -anything- in my CPU config in the BIOS. I didn't want to overclock, I wanted to control the fans.
Here's another look at my problem: CPU usage is hovering near, what, 20% ish? And all 8 cores are screaming at 100% and I'm burning up 40W for no good reason. The only way to stop this is to go into Windows power config and drop the max CPU %.
(This image shows current in the left column, then min, and max)
perhaps trying change on bios :
Global C-state Control = Enabled
Power Supply Idle Control = Low Current Idle
CPPC = Enabled
CPPC Preferred Cores = Enabled
AMD Cool'n'Quiet = Enabled
PPC Adjustment = PState 0
Windows 10 Power Plan on Balanced, CPU min 99% and max 100%.
Otherwise, wait for new bios with AGESA 18.104.22.168 or try to back flash to bios 1.90 with AGESA 22.214.171.124. Just to check if it's the cpu or motherboard bios issue.
To b clear, you're suggesting I do all these things even though I never changed them in the first place? What's happened is... I mean I hesitate to say it's absolutely a software problem, but I didn't muck about in the BIOS at all, before or after the problem started. This is something to do with A-Tune, Ryzen Master and Windows 10, I'd have thought.
so I think, one of the software or driver previously used have switched some running state, upgrading or uninstalling it may have lets this switch on not desired position. Usually we can found this on register data base, but where ?
Also checking autostart software list and running services may help.
To be sure that this issue came from windows, you may try a live linux on usb key and check core speed.
And/or launch windows in safe mode.
No, I do not. I've never tried, nor wanted to overclock this CPU. Ryzen Master and A-Tune are the only two apps I've used, the former to get an idea of what the CPU was doing, the latter to control the fan curves.
I tried pretty much everything, even used Microsoft's stubborn app removal tool and AMD's app removal tool and the problem persisted.
I took your advice and did a quick fresh reinstall of Windows 10, and the problem was solved. So I still don't know what the problem was, but I suspect it was Ryzen Master. A lot of people on the internet point to that application as a problem... And since no one had any better ideas, anywhere, reinstalling Windows was the only choice.
So it works now, thanks for your help. I hope it never happens again!
The problem started happening again and I had almost resigned myself to the fact that I'd never have my CPU running normally again, until I found someone talking about IDLEDISABLE. Their fix, manually forcing IDLEDISABLE to 0, solved my problem instantly. But what was setting it to 1 in the first place? Without an idle mechanism, the CPU had no mechanism for spinning down when it wasn't under load.
It turns out my capture device driver was activating IDLEDISABLE to minimize latency. Simply leaving my capture device unplugged until I need it let the CPU run normally.
So it's all fixed now. ^__^