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RE: [PATCH v8 10/18] docs/system/devices/usb: Note the automatic hub change
- To: Junjie Cao <junjie.cao@xxxxxxxxx>
- From: Jamin Lin <jamin_lin@xxxxxxxxxxxxxx>
- Date: Fri, 6 Nov 2026 03:31:30 +0000
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- Thread-topic: [PATCH v8 10/18] docs/system/devices/usb: Note the automatic hub change
Hi Junjie
> Subject: Re: [PATCH v8 10/18] docs/system/devices/usb: Note the automatic
> hub change
>
> Hi Jamin,
>
> On Mon, Nov 02, 2026 at 09:22:17AM +0000, Jamin Lin wrote:
> > +A machine type older than 11.2 plugs a virtual USB hub into the last
It should be updated to 11.3.
> > +free port, so that more devices fit. A newer one does not, and a
> > +device that finds no free port fails.
>
> With the series going into 12.0 this becomes "older than 12.0".
>
> It would also help to say how to get a hub back. piix3-usb-uhci has two
> ports, so
> -usb with usb-kbd, usb-mouse and usb-tablet already fails on the newest
> machine type (pc-i440fx-11.2 on v8). Either of these fixes it here:
>
> -device usb-hub (ahead of the other devices)
> -global piix3-usb-uhci.auto-hub=on
>
> Junjie
Thanks for the review and suggestion. Will add.
Jamin
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