It's very annoying and I think it happened since last update, the fan of the CPU runs louder, that means probably faster than usual. It's really the CPU and not the NVIDIA fan. I already tried some things.
I modified grub config:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force acpi_osi=linux"
GRUB_CMDLINE_LINUX="acpi_enforce_resources=lax"
I read that the first one is for buggy BIOS, the second one was an issue with it87 kernel module. sensors-detect wanted me to load this module, but it was not loadable (modprobe it87 ended up with FATAL: Error inserting it87, so the second line solved it)
I also cleaned the fan and the CPU, although they were not that dusty, but didn't help either.
Although I want to get auto detection running again, I also tried to control it by fancontrol. But unfortunately, this won't work. I get...
PWM 255 FAN 0
Fan Stopped at PWM = 255
This fan appears to stop when the PWM is enabled;
perhaps the fan input shares a pin with the PWM output
on the sensor chip.
You cannot control this fan with this PWM output.
I already tried to load the previous kernel, but no result. By the way, my CPU usage is only at 4%, so there are no heavy processes running.
Output of sensors (I'm not sure why those ISA adapters have these strange values. Maybe it's a part of the problem?)
$ sensors
it8720-isa-0290
Adapter: ISA adapter
in0: +0.00 V (min = +0.00 V, max = +4.08 V) ALARM
in1: +1.63 V (min = +0.00 V, max = +4.08 V)
in2: +0.54 V (min = +0.00 V, max = +3.06 V)
+5V: +3.01 V (min = +0.00 V, max = +4.08 V)
in4: +4.08 V (min = +0.00 V, max = +4.08 V) ALARM
in5: +4.08 V (min = +0.00 V, max = +4.08 V) ALARM
in6: +4.08 V (min = +0.00 V, max = +4.08 V) ALARM
5VSB: +3.95 V (min = +0.00 V, max = +4.08 V)
Vbat: +3.42 V
fan1: 3375 RPM (min = 0 RPM)
fan2: 1310 RPM (min = 0 RPM)
fan3: 1303 RPM (min = 0 RPM)
temp1: +40.0°C (low = -1.0°C, high = +127.0°C) sensor = thermistor
temp2: +38.0°C (low = -1.0°C, high = -9.0°C) sensor = thermistor
temp3: -128.0°C (low = -1.0°C, high = +127.0°C) sensor = disabled
cpu0_vid: +0.613 V
intrusion0: OK
k10temp-pci-00c3
Adapter: PCI adapter
temp1: +39.0°C (high = +70.0°C)
(crit = +90.0°C, hyst = +88.0°C)
Any ideas?
sensors
, and boot from the livecd and try there to see if it is different.