scipion

Great - it seems to be working now. I tried to power off/power on the printer and I could see from the VM the printer when it was back. Without restaring the VM! I will do more tests with the standby mode/power off etc to see if everything is ok. What was misleading for me when I initially saw this option was the decription: "Auto connect at plugin and VM start", since I could see the printer after restarting the VM, I didn't conclude that it works also without restarting the VM. Thanks a lot for your help!

Thanks for your answer I have already the plugin set as below: And I have this in the settings of the VM: What changes should I do in the above to implement what you suggested? Thanks

Thanks - Theorically this should work as the printer is in the same IOMMU group with other USBs that I don't need. Although I don't know how to do it 😀 I will have to search the documentation and articles how to do so. I still believe that a keep-alive or refresh script (if possible) is a lighter approach

In order to have a shared network printer, I used an USB printer and I managed to configure a print server on an Ubuntu VM running on my unraid server. I configured the VM with the option 'USB Devices' set as follows: Everything works fine when the printer is powered on and the VM started. I could see the printer connected from the VM: But I noticed that after some time the connection to the usb on the VM is lost. Most likely because the printer went in standby mode. Even when I power on the printer the connection is not restored and I have to restart the VM. [Edit] Not exactly when the printer goes on standby or restarted , but on the first print request after this. I ran a script to check using lsusb. The printer was always displayed. When I sent a print request the printer disappeared from lsusb output I could see this by running lsusb on the VM and on unraid server: On unraid: On the VM: As I am able to know if the printer is available or no on both the VM and the unraid server: is there a way to restore/refresh the USB connection using command lines or file modification that I can execute on-demand or trigger automatically on regular basis? In such case I can script something on the unraid server on the VM to avoid having to restart the VM if possible. Thank you for any help or hints.