25 Jun
2023
25 Jun
'23
midnight
Colin Fletcher <colin.m.fletcher(a)googlemail.com> writes:
Could be "turbo" mode? The CPU is clocked at
a speed that'll cause it
to run too hot if fully loaded, and throttled back when the
temperature rises. You can see the current state, and turn it off &
on, via:
/sys/devices/system/cpu/intel_pstate/no_turbo
Write '0' there to enable turbo mode, '1' to disable it. Disabling it
makes my laptop run a lot cooler.
Attached the tiny shell script I use to see & change the setting, in
case that's useful.
When the module thinkpad_acpi (I suspect dependent on laptop type) is
loaded with the option fan_control=1 you can do things like
echo level 7|sudo tee /proc/acpi/ibm/fan
or
echo level disengaged|sudo tee /proc/acpi/ibm/fan
(the last one is the loudest and fastest) in order to set a particular
fan speed.
echo level auto|sudo tee /proc/acpi/ibm/fan
resets to temperature-based.
My laptop has a thermal design power of 35W and my CPU of 45W, so if I
am doing heavy computations, I tend to crank the fan up in advance
because it will underestimate where it has to go for a given
temperature.
--
David Kastrup