Warren, thanks for the additional info. I assume that the yottamaster device runs Linux, just like 99% of other such devices. as to whether it uses linux software raid or some cheap (megaraid???) chipset, I don't know, nor know how to tell. but I'll check that URL you sent and see what happens. Thanks again! Fred On Sat, Jan 2, 2021 at 12:28 PM Warren Young <warren at etr-usa.com> wrote: > On Jan 2, 2021, at 9:55 AM, Fred <fred.fredex at gmail.com> wrote: > > > > Plantronics USB headset/microphone? > > Yottamaster RAID-1 storage (USB3)? > > Behringer USB audio interface? > > Logitech wireless mouse? > > Leopold USB keyboard? > > HID devices won’t go to sleep when the computer does, else they couldn’t > wake it back up. (Keyboard & mouse, mainly.) > > The two audio interfaces may or may not sleep. Try checking their > indicator LEDs when the computer goes to sleep: I’d expect them to visibly > show that they’ve gone to sleep if they do. If they do, then on wake, they > *could* do this sort of thing. > > I’d go after the RAID enclosure first, particularly if it’s hardware RAID, > since that means it’s “clever,” thus suspect. Check that you’ve got the > current firmware: > > https://www.yottamaster.com/?route=common/driver > > If it’s one of their JBOD models, requiring that you do some sort of > software RAID, I’d expect a much different report in the kernel log if the > corresponding software RAID component had a bug, which would mean it’s got > some fundamental USB compatibility problem if that’s the device causing the > problem. Again, check for firmware updates. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >