Comment 284 for bug 1667750

I'm using "stock Ubuntu 20.04"

I have this happening on kernel 5.4.0 .

[ 4063.051692] usb 3-10.4: New USB device found, idVendor=0483, idProduct=5740, bcdDevice= 2.00
[ 4063.051695] usb 3-10.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4063.051696] usb 3-10.4: Product: ChibiOS/RT Virtual COM Port
[ 4063.051698] usb 3-10.4: Manufacturer: STMicroelectronics
[ 4063.051699] usb 3-10.4: SerialNumber: 400
[ 4063.058680] cdc_acm 3-10.4:1.0: ttyACM1: USB ACM device
[ 4073.043695] xhci_hcd 0000:00:14.0: WARN Cannot submit Set TR Deq Ptr
[ 4073.043697] xhci_hcd 0000:00:14.0: A Set TR Deq Ptr command is pending.
[ 4073.059819] xhci_hcd 0000:00:14.0: WARN Cannot submit Set TR Deq Ptr
[ 4073.059822] xhci_hcd 0000:00:14.0: A Set TR Deq Ptr command is pending.

I plugged in my development board that provides a virtual comport. I then hit boot-and-reset buttons on the board to make it boot into DFU bootloader mode.

This has worked the last decade or so. I didn't read everything above, but I saw something about AMD... I have:

00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)

as the USB controller: Not AMD. -> Not hardware vendor related imho.