On Wed, Feb 09, 2022 at 12:13:28PM +0200, Eduard-Bogdan Budai wrote: > Thank you very much for your answer. > > The newest kernel that is in the standard Ubuntu 20.04 repositories is > today Linux 5.13.0-28-generic #31~20.04.1-Ubuntu SMP Wed Jan 19 14:08:10 > UTC 2022 x86_64). After moving from 5.13.0-27-generic #29~20.04.1-Ubuntu > to the newest 5.13.0-28-generic #31~20.04.1-Ubuntu, the dmesg showed: > > [Wed Feb 9 11:38:51 2022] usb 3-2: new full-speed USB device number 4 > using xhci_hcd > [Wed Feb 9 11:38:51 2022] usb 3-2: New USB device found, idVendor=067b, > idProduct=23a3, bcdDevice= 1.05 > [Wed Feb 9 11:38:51 2022] usb 3-2: New USB device strings: Mfr=1, > Product=2, SerialNumber=0 > [Wed Feb 9 11:38:51 2022] usb 3-2: Product: ATEN USB to Serial Bridge > [Wed Feb 9 11:38:51 2022] usb 3-2: Manufacturer: Prolific Technology > Inc. > [Wed Feb 9 11:38:51 2022] usbcore: registered new interface driver > usbserial_generic > [Wed Feb 9 11:38:51 2022] usbserial: USB Serial support registered for > generic > [Wed Feb 9 11:38:51 2022] usbcore: registered new interface driver > pl2303 > [Wed Feb 9 11:38:51 2022] usbserial: USB Serial support registered for > pl2303 > [Wed Feb 9 11:38:51 2022] pl2303 3-2:1.0: unknown device type, please > report to linux-usb@xxxxxxxxxxxxxxx > > A 5.4.0-99-generic #112~18.04.1-Ubuntu SMP Thu Feb 3 14:09:57 UTC 2022 > x86_64 from a Ubuntu 18.04 recognizes the same adapter as a ttyUSB0 > (which is what is needed to be used). > > Unfortunately, the environment in which happened what I described below > has certain restrictions that don't allow me to try a newer kernel than > the newest that is in the standard Ubuntu repositories... I would suggest going and getting support from those that are imposing those odd restrictions on you, as they are not allowing you to use the hardware you need to use :( Good luck! greg k-h
