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List:       qubes-users
Subject:    Re: [qubes-users] USB webcam forwarding
From:       Bertrand Lec <brtrndlc () gmail ! com>
Date:       2018-10-31 20:00:03
Message-ID: 9cdf933e-ae01-4508-b257-fb62339ab7ce () googlegroups ! com
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Le mercredi 31 octobre 2018 13:26:25 UTC+1, awokd a écrit  :
> Bertrand Lec wrote on 10/31/18 11:55 AM:
> > Le mercredi 31 octobre 2018 12:35:27 UTC+1, awokd a écrit  :
> > > tfm853 via qubes-users wrote on 10/30/18 8:30 PM:
> > > > I'm trying to use a C920 USB camera on a Thinkpad X1 Carbon 6gen, latest \
> > > > Qubes4. The VM is running debian-9, but i also tried fedora-26. I tried both \
> > > > connecting the camera directly to a USB port of the Thinkpad and via a \
> > > > powered USB hub.
> > > 
> > > > 
> > > > Qubes shows the device as still being attached to the VM. I can detach and \
> > > > reattach without problems. 
> > > > Forwarding the Thinkpad's internal camera works fine.
> > > > 
> > > > Are failures with particular USB devices to be expected? Does anyone know a \
> > > > good external webcam that works? 
> > > 
> > > Yes, some devices don't work well through redirect. If you have a spare
> > > USB controller (not in use for your mouse & keyboard) you can assign it
> > > directly to the VM and then connect the webcam, but you lose isolation
> > > between that controller and the VM.
> > 
> > Do you have an idea of _why_ some devices do not work well though redirect? I \
> > have the same problem with a network interface from a docking station.
> 
> My guess is only some USB commands are making it through and devices 
> that use more obscure ones run into problems. I'm no developer, though. 
> Webcams in particular have been an issue for a while:
> 
> https://github.com/QubesOS/qubes-issues/issues/2594
> https://github.com/QubesOS/qubes-issues/issues/4035
> 
> Didn't list them all. Does your docking station NIC show up as a USB 
> device? If not, it's a different issue.

Yes, it's a USB device, managed by sys-net.

Bertrand

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