On Sat, 2021-03-27 at 09:50 +0800, Ed Greshko wrote: > On 27/03/2021 07:20, Patrick O'Callaghan wrote: > > This never happens if I run the script directly from the command > > line > > (i.e. the drives power down and stay down). > > > > Clearly the docking unit isn't just doing this flakily on its own. > > Something is making it happen, and I've no idea how to discover > > what it > > is except that it seems to be correlated with systemd in some way. > > Just "thinking out loud" here. > > When you run the script from the command line it is after you've > determined the unmount > has happened. How much time do you think elapsed between the actual > unmount and > running of the script? Do you have a delay between the time > inotifywait detects unmount > and powering down the drives? If so, does it help if you extend the > delay?
The power-down script loops as long as it detects that the drives are spun up (using hdparm -C), since they take few seconds to actually spin down. I can physically see them being spun down, then a couple of seconds later they spin up again, which can only be because something is accessing them. If I then invoke the same power-down script manually, they power down and stay down. I've now modified the script to run an outer loop three times over the power-down-and-check sequence, which so far seems to do the trick, but it's a real kludge. > I have never used it for this, but wireshark does have the ability to > monitor USB. Don't > know if that will reveal anything or be of any help. Only as a last resort. I don't fancy having to learn USB command sequences. poc _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
