Something like this might help, network managed power supply, can be
scheduled or used via a web browser.
https://www.openxtra.co.uk/p/aviosys-ip-power-switch-9258s-4-port-ip9258s
On 10/05/16 11:37, Rob Landry wrote:
On Tue, 10 May 2016, Cowboy wrote:
I've been ( on and off ) searching for a way to reset the USB buss
without a reboot, and sometimes a hard reboot. The problem seems to
be that while there are various "solutions" out there for resetting
the kernel's idea of the USB buss, there seems to be nothing for
resetting the BIOS idea of the USB buss without reloading BIOS, hence
a reboot.
I have a computer deployed on Cape Cod that has a Stellar Labs
555-17815 balanced USB audio interface that is driving me nuts. The
machine is in a studio and is used to run RDAirplay and RDPanel by
DJ's. It is left idle overnight, when the radio station is fed from a
Rivendell machine at the transmitter site, and often someoen will come
into the studio, start RDAirplay, and it won't play because Rivendell
no longer sees the interface. Stopping and restarting the Rivendell
daemons fixes the problem.
I have thought of running RDAirplay from a script that stops/restarts
the daemons before launching the program, but that requires root
privileges, and I don't want them running anything as root.
I am thinking of taking the machine out of service and substituting
something with a non-USB audio interface. Oddly, an identical machine
off Cape doesn't have the problem (why do weird, inexplicable problems
always happen on Cape Cod?).
In your case, I'm wondering if you simply unplug the USB connector, wait
a minute, and plug it back in, does that work ?
If the device gets its power from the USB connector, then yes, that
usually works.
However, one machine I'm saddled with has a Focusrite Scarlett 6x2
audio interface that is powered externally. It won't be recognized by
the OS until it is power-cycled. Booting the computer or
unplugging/replugging the USB connector will not make the interface
visible, only unplugging and replugging the interface's AC power cord.
Rob
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