UDEV change /devices/virtual/block/dm-2 (block) Running udevadm monitor gave a similar, although not quite as fast flow of messages, like this: KERNEL change /devices/virtual/block/dm-2 (block) Signal time=1676894325.366191 sender=:1.1 -> destination=(null destination) serial=4880991 path=/org/freedesktop/systemd1/unit/dev_2ddm_5cx2d2_2edevice interface= member=PropertiesChanged Variant string '/sys/devices/virtual/block/dm-2' Signal time=1676894325.365912 sender=:1.1 -> destination=(null destination) serial=4880989 path=/org/freedesktop/systemd1/unit/sys_2ddevices_2dvirtual_2dblock_2ddm_5cx2d2_2edevice interface= member=PropertiesChanged

I ran dbus-monitor -system which gave a very fast spooling run of messages, like the excerpt below: signal time=1676894325.355898 sender= -> destination=:1.245 serial=2 path=/org/freedesktop/DBus interface= member=NameAcquired Over the last couple of days, however, dbus-daemon and system-udevd have accounted for a constant 50% of CPU and haven't settled whilst the laptop has been running, causing the fan to run constantly.

I've always noticed a few minutes of high CPU from dbus-daemon when I initially log in, but it always then settles down to an acceptable level. I'm running Ubuntu 20.04.5 LTS and using the gnome-classic desktop (because I'm stuck in my ways).

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