Hey all,

I just wanted to share this. I had the problem - waking my PC up from standby mode - that the CPU fan is obnoxious loud, but I happened to realize it went normal after a high CPU load (compiling a big source tree via make -j 4 e.g.).

So I guess the "CPU Fan State" is somehow lost after stand by and it will first reset after a state change (warmer = recalibrate). To force this, there is a nice tool called stress:

Install it: apt-get install stress

Help: stress --help

Code:
`stress' imposes certain types of compute stress on your system

Usage: stress [OPTION [ARG]] ...
 -?, --help         show this help statement
     --version      show version statement
 -v, --verbose      be verbose
 -q, --quiet        be quiet
 -n, --dry-run      show what would have been done
 -t, --timeout N    timeout after N seconds
     --backoff N    wait factor of N microseconds before work starts
 -c, --cpu N        spawn N workers spinning on sqrt()
 -i, --io N         spawn N workers spinning on sync()
 -m, --vm N         spawn N workers spinning on malloc()/free()
     --vm-bytes B   malloc B bytes per vm worker (default is 256MB)
     --vm-stride B  touch a byte every B bytes (default is 4096)
     --vm-hang N    sleep N secs before free (default none, 0 is inf)
     --vm-keep      redirty memory instead of freeing and reallocating
 -d, --hdd N        spawn N workers spinning on write()/unlink()
     --hdd-bytes B  write B bytes per hdd worker (default is 1GB)

Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s

Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).

And finally run it only with high CPU load: stress --cpu 4

In htop I see 4 processes running at 100%, after a few seconds the CPU Fan is recalibrating and near impossible to hear, thanks to Arctic Cooler.


Hardware info:

Code:
Mainboard: FM2A68M-HD+
CPU: AMD A8-7600 Radeon R7
hardinfo report: https://killtube.org/downloads/kungfooman/hardinfo.html

I wonder if Linux is the problem or my hardware tho. I kinda tend to Linux problem, because I never experienced it via Windows. I installed all kinds of CPU fan sensor tools, but nothing even recognizes a fan.