while checking journalctl -ef logs I noticed the MiraBox capture card is endlessly connecting and disconnecting.

The logs show the following on repeat every two seconds

 1Dec 28 22:00:51 earth pipewire[45994]: spa.v4l2: '/dev/video0' VIDIOC_QUERYCTRL: Input/output error
 2Dec 28 22:00:51 earth pipewire[45994]: spa.v4l2: '/dev/video0' VIDIOC_QUERYCTRL: Input/output error
 3Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: USB disconnect, device number 79
 4Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: new high-speed USB device number 80 using xhci_hcd
 5Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: New USB device found, idVendor=1e4e, idProduct=7103, bcdDevice= 1.00
 6Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: New USB device strings: Mfr=6, Product=7, SerialNumber=3
 7Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: Product: MiraBox Video Capture 
 8Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: Manufacturer: MiraBox Video Capture 
 9Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: SerialNumber: 20000130041415
10Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: Found UVC 1.00 device MiraBox Video Capture  (1e4e:7103)
11Dec 28 22:00:54 earth kernel: usb 1-7.1.3.4: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.

I suspected that it’s put on sleep and it tries to connect again endlessly.

And sure enough, looking in sudo powertop under “Tunablese” tab. the Mirabox item shows “Good” in front of it.

The solution is to turn off the power saving from powertop. the logs stopped immediatly