Hey, My PL2303 adapter isn't working after I upgraded to 5.13. Looks like the culprit is commit 8a7bf7510d1f ("USB: serial: pl2303: amend and tighten type detection"). It used to work fine in 5.12.x. Now it fails like this: [246872.298632] usb 1-1: new full-speed USB device number 14 using xhci_hcd [246872.440065] usb 1-1: New USB device found, idVendor=067b, idProduct=23c3, bcdDevice= 3.05 [246872.440079] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [246872.440085] usb 1-1: Product: USB-Serial Controller [246872.440089] usb 1-1: Manufacturer: Prolific Technology Inc. [246872.440093] usb 1-1: SerialNumber: CMA>b103Y23 [246872.445098] pl2303 1-1:1.0: pl2303 converter detected [246872.445114] pl2303 1-1:1.0: unknown device type, please report to linux-usb@xxxxxxxxxxxxxxx Any ideas on how to fix it properly? Should I send a patch that handles bcdDevice == 0x305 and returns TYPE_HX for it from pl2303_detect_type()? Regards, Vasily