On Tue, Aug 05, 2025 at 07:07:03AM +0000, Ulrich Stoehlker wrote:

I have a Multi-Channel-Analyzer (MCA) interfaced via usb.
This device cannot be used on more recent kernels.
I get the following error message:

[663822.490455] usb 1-3: new high-speed USB device number 17 using xhci_hcd
[663822.616495] usb 1-3: New USB device found, idVendor=0557, idProduct=2008, bcdDevice= 0.01
[663822.616501] usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[663822.682309] usbcore: registered new interface driver usbserial_generic
[663822.682326] usbserial: USB Serial support registered for generic
[663822.686383] usbcore: registered new interface driver pl2303
[663822.686402] usbserial: USB Serial support registered for pl2303
[663822.686423] pl2303 1-3:1.0: pl2303 converter detected
[663822.686431] pl2303 1-3:1.0: unknown device type, please report to linux-usb@vger.kernel.org

Linux host1 6.8.0-64-generic #67~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Jun 24 15:19:46 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

But it works with older kernels:
Linux host2 5.10.103-v7+ #1529 SMP Tue Mar 8 12:21:37 GMT 2022 armv7l GNU/Linux

Would it be possible to correct this problem!?

That should be doable.

Could you please post the output of "lsusb -v" for this device?

Johan