Why is name not shown in Add Hardware for USB device?

[Tom Horsley]

If I go to "Add Hardware" in virt-manager and select USB host device,
I get a dialog with a list of things similar to lsusb output, but
some of the entries are blank. For instance, lsusb shows:

Bus 003 Device 022: ID 046d:0825 Logitech, Inc. Webcam C270

but the usb device dialog only shows Bus 3 device 22 with no
description for logitech webcam.

Is this a hint that usb passthrough won't work for this?

Certainly if I select the bus 3 device 22 item, I can
attach it, but the Windows 7 virtual machine doesn't
see anything show up.

Anyone gotten a webcam like this to work with qemu?

[VISEUR Eric]

Hi,

I think this has nothing to do with your device name not showing up.  I've already successfully attached devices that had no name showing up in virt-manager to a VM.  However, if you're using recent packages versions from the virt-preview or rawhide, I've recently pinpointed a permission problem with USB passthrough that results in the behaviour you're describing.  No fix yet, but that's a part of the game when using development versions :)

Best regards,

Eric VISEUR | System Engineer | THALES Belgium S.A.
Rue des Frères Taymans, 28 |B-1480 TUBIZE - BELGIUM | [e-mail]

-----Original Message-----
From: [e-mail] [mailto:[e-mail]] On Behalf Of Tom Horsley
Sent: 28 August, 2014 17:03
To: Fedora Virt
Subject: [fedora-virt] Why is name not shown in Add Hardware for USB device?

If I go to "Add Hardware" in virt-manager and select USB host device, I get a dialog with a list of things similar to lsusb output, but some of the entries are blank. For instance, lsusb shows:

Bus 003 Device 022: ID 046d:0825 Logitech, Inc. Webcam C270

but the usb device dialog only shows Bus 3 device 22 with no description for logitech webcam.

Is this a hint that usb passthrough won't work for this?

Certainly if I select the bus 3 device 22 item, I can attach it, but the Windows 7 virtual machine doesn't see anything show up.

Anyone gotten a webcam like this to work with qemu?
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[Tom Horsley]

On Thu, 28 Aug 2014 17:19:09 +0200
VISEUR Eric wrote:
> However, if you're using recent packages versions from the virt-preview or rawhide

Nope, this is straight fedora 20. Anything I can chmod 777 to see if it is
the same permission problem? Is something "helpfully" grabbing control of
the webcam as soon as it is plugged in so that qemu can't get to it? (Certainly
if I run cheese on linux, it can see images from the webcam just fine, so
udev must have made a /dev/video* for it).

[VISEUR Eric]

That actually interesting.  If it's the same problem, it means it comes from something else in the baseline Fedora packages.  Alas, I don't have time to look further into this right now...

Best regards,

Eric VISEUR | System Engineer | THALES Belgium S.A.
Rue des Frères Taymans, 28 |B-1480 TUBIZE - BELGIUM | [e-mail]

-----Original Message-----
From: [e-mail] [mailto:[e-mail]] On Behalf Of Tom Horsley
Sent: 28 August, 2014 18:12
To: [e-mail]
Subject: Re: [fedora-virt] Why is name not shown in Add Hardware for USB device?

On Thu, 28 Aug 2014 17:19:09 +0200
VISEUR Eric wrote:
> However, if you're using recent packages versions from the 
> virt-preview or rawhide

Nope, this is straight fedora 20. Anything I can chmod 777 to see if it is the same permission problem? Is something "helpfully" grabbing control of the webcam as soon as it is plugged in so that qemu can't get to it? (Certainly if I run cheese on linux, it can see images from the webcam just fine, so udev must have made a /dev/video* for it).
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[e-mail]
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