[vbox-dev] Troubleshooting a USB capture issue with multiple devices.

Klaus Espenlaub klaus.espenlaub at oracle.com
Mon Oct 14 16:52:49 UTC 2013

Hi Ribhi,

On 14.10.2013 17:46, Ribhi Kamal wrote:
> I'm trying to troubleshoot a problem with vbox 4.2.16 (windows 7 host)
> where virtualbox is unable to capture multiple devices when a virtual
> machine is starting up.
> In my testing, I'm only trying to attached USB SC readers (I have about
> 4 different vendors).

I assume that the USB SC readers are USB 1.1 (or at most 2.0) devices. 

Are you plugging any of them by chance into a "USB3 port" (in quotes, as 
this term is ambiguous, I mean a USB port connected to a USB3/xHCI 

> I managed to isolate the problem to a single case where it consistently
> fails:
> 1- Plug-in three USB SC readers to the host.
> 2- Create a VM and add a USB filter for each individual SC reader
> 3- ** Ensure that vboxsvc is not running **
> 4- From a command line prompt start the machine virtualbox.exe --startvm
> testing
> If I follow the steps above exactly, two SC readers will be captured and
> the third will state that it is captured; however, it is not forwarded
> to the guest.

All USB ports are alike? Or is there a pattern?

> I wrote this email back in 4.2.16 and didn't get a chance to send it. So
> I'm sending it now to find out if all the changes to the USB code could
> *possibly* address that problem. Further, I'm not sure if I should focus
> my testing, in relation to this issue, on 4.3 or the latest 4.2.

4.3 doesn't have significantly different code for handling USB compared 
to 4.2, so the version shouldn't matter much.


> Any advice would be greatly appreciated.
> Thanks,
> -- Ribh

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