[Core Plus+Vision Plus X] dmesg errors: "usb 2-5: Failed to suspend device, error -19"
Hi UP Community,
I have installed Ubuntu Server 20.04 on a new UP Core Plus board with an UP Vision Plus X, following these Ubuntu 20.04 intallation instructions
Everything seems to be functionally working, and I can run the
.../deployment_tools/demo/demo_benchmark_app.sh with and without the
-d MYRIAD flag and get ~230 and ~45 fps throughput respectively. (I don't know what to expect, but seems good).
dmesg log is completely littered with the messages:
... [ 14.577868] usb 2-5: new SuperSpeed Gen 1 USB device number 75 using xhci_hcd [ 14.602845] usb 2-5: New USB device found, idVendor=05e3, idProduct=0620, bcdDevice=93.03 [ 14.602851] usb 2-5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 14.602855] usb 2-5: Product: USB3.1 Hub [ 14.602858] usb 2-5: Manufacturer: GenesysLogic [ 14.604704] hub 2-5:1.0: USB hub found [ 14.605228] hub 2-5:1.0: 4 ports detected [ 14.885670] usb 2-5: USB disconnect, device number 75 [ 14.885695] usb 2-5: Failed to suspend device, error -19 ...
The errors occur seemingly at random, sometimes they trickle in at about one per second, sometimes I see a rush of several hundreds of them over several minutes, and sometimes they don't occur for hours.
Apart from at least one such error always occurring at boot, I can't see any pattern. It seems neither related to workload nor whether I have used the MYRIAD devices or not.
I also saw the errors already before I updated the kernel.
I tried to reinstall the OS, and switched to another power source (12V, 2A), but the errors occurs (... but possibly to a somewhat lesser extent).
Is this normal, or is there a known fix, or may I have defective hardware?
I don't want to evaluate the merits of this hardware based on a faulty unit.
Maybe unrelated, but twice (in the first couple of days) the system also froze completely, and would not respond to
ping let alone
ssh, and I had to power-cycle.
I haven't had a freeze since I re-installed the OS (~24 hours), but I still suspect it might be related to the usb error.
If the hardware is freezing occasionally, it would mean a no-go for this hardware on my projects.
Very thankful for any help on this.
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