Re: High-Impact: xhci_hid - "Not enough bandwidth for new device state"

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Jul 23, 2019 at 02:31:18PM +0200, Frank Bergmann wrote:
> Dear Linux-USB,
> 
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1411604
> 
> - This bug is around since 5 years.
> 
> - Severity: High
> 
> - "It's not Fedora specific, it's linux in general"
> 
> 
> There are 671 results in Google for 'USB "Not enough bandwidth for new
> device state"'. Why does nobody take this on?

Because there's not much to be done here.  You are trying to add a
device to the USB bus that is asking for more bandwidth than the bus
currently can provide.  So we fail the device addition.  What are we
supposed to do instead?

> 
> 
> I offer to send you or whoever a Logitech C922 WebCam if it accelerates the
> process :-)
> 
> 
> The bug basically keeps people from using a USB 3.0 WebCam in parallel to
> some virtual machine Audio. This means it will affect any "professional"
> users who need to do GoToMeeting or WebEx together with running a Windows
> VM.

Why do you say that?  Many people have that configuration working just
fine.  Personally I have a ton of USB devices all plugged into one USB 3
port running at the same time (webcam, audio devices, keyboard, mouse)
and video conferences work just fine with that.

Try plugging the device into a separate USB root hub and you should be
fine, as we can't do the impossible here (get extra bandwidth than what
is present on the system).

thanks,

greg k-h