[ovirt-users] USB 2.0 compatibility -- RESOLVED!

[Yedidyah Bar David]

On Thu, Feb 9, 2017 at 2:09 AM, Jonathan Woytek <woytek at dryrose.com> wrote:
> I was finally able to resolve this. So that maybe other users can find how
> to fix this if they run into the same issues:
>
> tl;dr:
> Edit the virtual machine in question, go under Console, make sure SPICE is
> chosen for graphics, and under "USB Redirection" choose "Native." When you
> reboot the VM, it will have both UHCI and EHCI (2.0) controllers. Now, any
> USB 2.0 devices that you attach will work correctly.
>
>
> Long version:
> I struggled with this for quite a while. While doing some additional
> research, I found a note in the 4.1.0 release notes referencing BZ 1373223.
> This particular note was for ppc64 architecture systems, but it curiously
> said that enabling USB Redirection under SPICE would change the USB
> controllers available on the host. I dug a little deeper into the bug thread
> and found a couple of references that seemed to indicate that x86/x86_64
> exhibited the same behavior. Apparently, UHCI (1.1) is the default because
> it supports SmartCards, but the EHCI (2.0) controller does not. So, turning
> on USB Redirection under SPICE settings for the console enables an EHCI
> controller, thereby enabling devices that require USB 2.0.

Thanks a lot for the report!

>
> Personal opinion:
> This is really obfuscated. It would be great if this switch lived somewhere
> more obvious. Even if that doesn't happen, this should exist in a document
> somewhere. Maybe it does and I couldn't find it, but I tried!

Would you like to open an RFE and suggest a new arrangement for the UI,
and push a doc update to the website?

Best,
-- 
Didi