T60: Xubuntu 20.04 LTS reduces maximum fan speed

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Hello Everybody,

I hope this is the right place for bugs - if it is one... I'm more a
Linux user than hacker.
I just upgraded my T60 from some old Ubuntu from ~2016 to the newest
release and found out that the fan is really quiet --- and the thing is
overheating under load (crashing).

When I read the rpm in auto mode the fan is around 3500 rpm even for
high thermal sensor values.

When I control it manually to 7 it hardly reaches 4000rpm.
In disengaged it slowly increases until the watchdog restores the value.

I remember that before the update the fan was more noisy and somewhere I
found that it should reach higher rpms.

Is this a bug in this kernel module, or do I need to search somewhere else?

Some terminal outputs:

leo@leo-ThinkPad-T60:/proc/acpi/ibm$ cat fan thermal
status:		enabled
speed:		3511
level:		auto
commands:	level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:	enable, disable
commands:	watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
temperatures:	72 48 44 -128 50 -128 35 -128 55 55 62 -128 -128 -128 -128
-128
leo@leo-ThinkPad-T60:/proc/acpi/ibm$ echo level 7 > fan
leo@leo-ThinkPad-T60:/proc/acpi/ibm$ cat fan thermal
status:		enabled
speed:		3936
level:		7
commands:	level <level> (<level> is 0-7, auto, disengaged, full-speed)
commands:	enable, disable
commands:	watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
temperatures:	67 48 43 -128 50 -128 35 -128 55 55 61 -128 -128 -128 -128
-128

Would be great if someone could check that.. Under these circumstances
my T60 is going to be toasted soon :(

Thanks & Best Regards
leo

--
http://leo.j-crew.de


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