Hi iordan, On Sat, Dec 25, 2021 at 11:49 PM i iordanov <iiordanov@xxxxxxxxx> wrote: > > Hey Frediano, > > Thanks for responding - so I take it this is a server-side setting > (how many channels are attached to the VM)? Yes, the USB (usbredir) devices are defined in the VM configuration (likely via a libvirt domxml file). If you need more than 2 USB devices connected to the guest at the same time, add more such devices to your 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? Both remote-viewer (virt-viewer) and the spicy test tool use spice-gtk's usb device widget which has this information. Alternatively, you can get "free-channels" from spice-gtk's usb device manager Uri. > > Thanks! > iordan > > On Fri, Dec 24, 2021 at 4:05 AM Frediano Ziglio <freddy77@xxxxxxxxx> wrote: > > > > Il giorno gio 23 dic 2021 alle ore 23:38 i iordanov <iiordanov@xxxxxxxxx> 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 > > > > -- > The conscious mind has only one thread of execution. >