[Spice-devel] error: No free USB channel

[i iordanov]

Hey Frediano,

Thanks for responding - so I take it this is a server-side setting
(how many channels are attached to the VM)?

Also, is there a spice-gtk API that may be used to obtain the number
of available USB channels at any given time? I.e. the UI of any client
application should have a way to inform the user how many "ports" are
still available at any point, right?

Thanks!
iordan

On Fri, Dec 24, 2021 at 4:05 AM Frediano Ziglio <freddy77 at gmail.com> wrote:
>
> Il giorno gio 23 dic 2021 alle ore 23:38 i iordanov <iiordanov at gmail.com> ha scritto:
>>
>> Hi guys,
>>
>> During my testing I've been unable to connect more than 2 USB devices
>> at a time - could you please help me figure out why that's happening?
>>
>> The backend starts returning error with message "No free USB channel",
>> but I can't see how to tune the number of USB channels available!
>>
>> 2021-12-23 15:27:52.608 29721-29760/com.iiordanov.aSPICE
>> D/android-service: connect_cb: start
>> 2021-12-23 15:27:52.608 29721-29760/com.iiordanov.aSPICE
>> I/android-service: connect_cb: successfully redirected device
>> 2021-12-23 15:28:00.499 29721-29760/com.iiordanov.aSPICE
>> D/android-service: connect_cb: start
>> 2021-12-23 15:28:00.499 29721-29760/com.iiordanov.aSPICE
>> I/android-service: connect_cb: successfully redirected device
>> 2021-12-23 15:28:03.582 29721-29760/com.iiordanov.aSPICE
>> D/android-service: connect_cb: start
>> 2021-12-23 15:28:03.582 29721-29760/com.iiordanov.aSPICE
>> E/android-service: connect_cb: failed to redirect device, error: No
>> free USB channel
>> 2021-12-23 15:28:06.385 29721-29760/com.iiordanov.aSPICE
>> D/android-service: connect_cb: start
>> 2021-12-23 15:28:06.385 29721-29760/com.iiordanov.aSPICE
>> E/android-service: connect_cb: failed to redirect device, error: No
>> free USB channel
>> 2021-12-23 15:28:08.634 29721-29760/com.iiordanov.aSPICE
>> D/android-service: connect_cb: start
>> 2021-12-23 15:28:08.634 29721-29760/com.iiordanov.aSPICE
>> E/android-service: connect_cb: failed to redirect device, error: No
>> free USB channel
>>
>> Your help is very appreciated.
>>
>> Thanks!
>> iordan
>>
>
> Hi,
>   this is expected. Every USB channel allow to attach one USB device. Is like having 2 physical USB ports on your computer. If you don't use an HUB you can attach only 2 USB physical devices. Currently there's no software USB hub so one USB device takes one USB channel and by default only 2 USB channels are attached to the VM.
>
> Frediano



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