An upgrade to Beowulf went very smoothly but since upgrading I notice
that the fans are always running. Although the air temperature is about
25°C the cores seem to run much hotter than necessary, pushing 70°C or
hotter. The system is not really under any load. What should I be
looking at to make corrections?

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$ grep -i pretty /etc/os-release ; uname -sr
PRETTY_NAME="Devuan GNU/Linux 3 (beowulf)"
Linux 4.19.0-9-amd64


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coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +75.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +75.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +70.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:        +70.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:        +70.0°C  (high = +100.0°C, crit = +100.0°C)
Core 4:        +69.0°C  (high = +100.0°C, crit = +100.0°C)
Core 5:        +70.0°C  (high = +100.0°C, crit = +100.0°C)

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +73.0°C  (crit = +120.0°C)

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1:        +44.0°C

pch_cannonlake-virtual-0
Adapter: Virtual device
temp1:        +60.0°C

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top - 13:32:45 up 21:00, 11 users,  load average: 0.90, 0.97, 0.99
Tasks: 309 total,   1 running, 308 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.1 us,  0.4 sy,  0.0 ni, 99.5 id,  0.0 wa,  0.0 hi,  0.0 si,
0.0 st
MiB Mem :  15752.8 total,   6909.7 free,   2698.7 used,   6144.4 buff/cache
MiB Swap:  15743.0 total,  15742.6 free,      0.4 used.  12197.7 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+
COMMAND

 2529 root      20   0  493780 133052  98824 S   4.7   0.8  21:21.22
Xorg

  291 root     -51  19       0      0      0 D   3.7   0.0  20:10.16
irq/144-SYNA120

 2839 lars      20   0  520740  50288  33980 S   1.0   0.3   0:22.16
xfce4-terminal

29662 root      20   0   12236   3020   2400 R   0.3   0.0   0:13.18 top

    1 root      20   0    7904   2064   1892 S   0.0   0.0   0:02.10
init

    2 root      20   0       0      0      0 S   0.0   0.0   0:00.04
kthreadd

    3 root       0 -20       0      0      0 I   0.0   0.0   0:00.00
rcu_gp