[RDD] USB audio woes

Wayne Merricks waynemerricks at thevoiceasia.com
Tue May 10 07:53:15 EDT 2016

Something like this might help, network managed power supply, can be 
scheduled or used via a web browser.


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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