Need help with USB on Windows hosts

Discussions related to using VirtualBox on Windows hosts.

Re: Need help with USB on Windows hosts

Postby aproject » 29. Feb 2012, 22:38

I am having the same problem trying to get 8-port USB serial device attached to the XP host working on the Ubuntu guest (Ubuntu 10.04.3).
I am running VirtualBox 4.1.8 with extensions installed on the host.
The 8-port serial adapter appears to be set up as (internal) hub and eight individual FT232R serial interface chips.

When I start the guest (with the USB serial adapter attached to the host XP machine), virtualbox will usually grab 6 or 7 of the 8 ports, however, which ports are grabbed is inconsistent from one startup to the next. If I try to attach one of the orphan ports (right-click on the USB symbol at the bottom of the guest window to select one of the unfortunately de-selected USB devices), I get an error message "Failed to attach..." with E_INVALIDARG and "busy with a previous request".

This is really unfortunate misbehavior because it makes it difficult/impossible to deliver my solution if it behaves differently each time.

From searching/reading I see I am not alone in this issue, but I did want to add to this thread so an example of the misbehavior is shown on 4.1.8.
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Joined: 10. Feb 2012, 17:03


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