Originally Posted by laxu
Has anyone ran into this weird issue?
After some gaming the fan connected to the SYS_FAN4 header seems to get stuck at 100%. Restarting the machine fixes this. Using F42b BIOS with a 3700X.
The fan in question is set to manual in BIOS and to only go to 100% in extreme temp situations which just don't occur. Still occurs on normal or silent profile. I have tried connecting different fans to it and it happens with all of them, just on this specific fan header.
I don't remember if it happens with SYS_FAN4 header, but i have a strange issue with fans too. From time to time, just after the post, the fan connected to that particular header (i'll check if it's SYS_FAN4) stops, it's like the header isn't pumping enough juice to the fan. Happens with any of my fans (all noctuas, different sizes). Happens rarely on latest bios, was more frequent on older bioses.
I suspect it's a bios bug of some sort. I have a custom fan curve, the minimum speed i've set is way above the min supported by my fans, so that's not the problem.
There could be a bug involving that header (or fan headers in general). I'll let you know if it's SYS_FAN4 for me too.
edit: if i reboot, enter bios and save, without touching anything, the problem fixes by itself, supporting the idea that's a bios bug