Re: [gentoo-user] USB random disconnections in VB Win10 VM

[Mark Knecht]

On Thu, Jul 14, 2022, 4:25 PM Wol <antlists@××××××××××××.uk> wrote:
>
> On 14/07/2022 18:42, Mark Knecht wrote:
> > If instead I'm in Linux with a Win10 VM running I can run the same
> > software in the VM, and it will always see the external DSP when first
> > started, but at random times, generally 5-20 seconds but never more than
> > 5 minutes, the software will tell me the USB connection has been
> > interrupted and I am forced in the software to reestablish a connection.
> > I am always able to reconnect but I am so far unable to keep it
connected.
>
> Is there a setting in VB to say "take over the USB port"? ISTR something
> of the sort, which would basically let Win10 take over the port and
> drive it, with linux out of the picture.
>
> Don't trust me on this, I don't play with USB and it's ages since I
> stumbled across this, but it's worth taking a look.
>
> Cheers,
> Wol


Good questions. I'm not sure with USB. As I understand it there
are options in Virtualbox to pass through complete pieces of hardware.
I've read that people do this with complete graphics cards. In theory
possibly it could be done with USB but my guess is it might be
difficult as most USB controllers are part of the chipset. Still, it's worth
some study.

As this DSP processor is identified as an audio device I wondered
today if possibly pulseaudio might be trying to grab it. I intend to
look into configuring PA not to touch it.

There's also (possibly) blacklisting certain USB device IDs. In the
VM I configured it to understand the device ID and hook to it.
Possibly I can tell the Linux USB stack to ignore this device so that
PA or some other part of the system just stays away.

But being that the DSP device is an guitar amplifier modeler
and my new Tele came back from my guitar tech at lunchtime
I spent the afternoon playing the guitar! Nonproductive but fun!

Thanks for the ideas,
Mark