Comment 471 for bug 1690085

Did the ppl with the new BIOSes double test the 'Power Supply Idle Control' option by disabling it temporary? Because, it could also be fixed by that Agesa update some of you mentioned (also mentioned in [1])

tl;dr:
Had soft lockup at full load, BIOS-update seems to help, but it doesn't have the 'Power Supply Idle Control'-option.

More details:
My HP 17-ca0202ng (Ryzen 2500U) was stable by starting up with "idle=nomwait" Kernel-parameter for 2~3 weeks until *something*[2] happened and from one day to the next it was hard-locking again and on another testrun it threw the soft-lock-error (NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s!) while it was transcoding x264-stuff to x265 (kind of full load; 95% @ all 8 threads). It was bootet up by "nomodeset" at the time the errors occur, so I'm quite sure it can't be amdgpu-related.
The time the soft-lock occurred, the system was kind of responsive, just freezing after a amount of seconds with unfreezing after another amount of seconds. I was able to run dmesg and just saw that NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! for all threads, before more freezings in shorter amount of seconds appeared and the system completely froze. Strange!

But: HP provided a BIOS-Update (F4 > F10) some days ago, I was able to update it yesterday and I've done 8 hours of full-load testing, 8 hours of idle testing and 7,5 hours of partial-load testing. No lockup so far and no Kernel-parameters needed (running Ubuntu's mainline build kernel 4.17.2, the stuff from Padoka stable ppa and ravenridge firmware from [3] to prevent amdgpu-freezes). As any lockup occurred within 3 hours, the laptop seems to be stable (or at least "more stable" than before).
Can't say anything about the changes HP made in that update, because they don't provide a changelog. But it's a laptop, so it has 3 or 4 BIOS-options (something virtualisation something, something secure boot something and some boot order options) and for sure no 'Power Supply Idle Control'. Allow me to point out, that Laptops usually have power adapters special designed for the device. So it can't be power supply related as AMD said (IMO).

[1] https://community.amd.com/thread/225795 , https://community.amd.com/thread/224000
[2] May be microcode-update related provided by Ubuntu, but I can't remember for sure.
[3] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amdgpu