Hi again.
Ubuntu AFIK has some power managing features, but they may be
dependant on the platform hardware capabilities too.
Personally I can't get on with the Ubuntu UI, so I run LMDE (Mint
without the Ubuntu bits.)
Running on an older Dell XPS laptop, the Cinnamon desktop power
management features work well, to the point of annoyance if using
for example a SDR dongle!
On a HP small format desktop, the CPU power management seems to
work, but it leaves the USB ports powered all the time, but that
may also be a "feature" of the PC hardware and/or BIOS of course.
I have found that running? $
dmesg -WH ? in a terminal session, and then trawling
through the list after something odd happens, can give some clues,
but it can be serious eye aching stuff!
Or pipe that to a file, and grep it later, if one knows what to
look for.? Pulling the USB lead and seeing what happens to find a
suitable clue to search for might work.
As you are "afloat", there could still be some RF about, from
other vessels nearby at times?? Parhaps a TinySA running in peak
hold mode might help too?? (And that's another distracting Rabbit
Hole to drop into if you're not careful!)
73.? Hope the wet stuff stays outside the hull!
Dave G8KBV.