I'm using Linux Ubuntu 20.04 with HWE. I have two HDDs installed and those never go to sleep even if their usage is none for 5+ minutes (that's the setting in gnome Disks manager).
This used to work some time ago, but now doesn't seem to. If I manually put both disks to sleep, those stay as such for hours, so not quite sure what's preventing this from happening.
How can I find this out?
lsof don't report of any file open on those mounts (i.e.
/disk6) - I've set the timer to 5 minutes, from 10 and I'll report what happens.