RPI 4 pl2303 / pl2303x issue.

[ambush276]

When i am trying to connect to my device over my pl2303/2303x usb rs232 converter, i am getting this in syslog.

```Aug 9 10:09:56 raspberrypi kernel: [ 4348.406189] pl2303 1-1.1.1.4:1.0: pl2303_vendor_write - failed to write [0008]: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.406538] pl2303 1-1.1.1.4:1.0: pl2303_vendor_write - failed to write [0009]: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.406908] pl2303 ttyUSB0: pl2303_get_line_request - failed: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.407282] pl2303 ttyUSB0: pl2303_set_line_request - failed: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.407654] pl2303 1-1.1.1.4:1.0: pl2303_vendor_write - failed to write [0000]: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.407934] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.408176] pl2303 ttyUSB0: pl2303_set_control_lines - failed: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.408270] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - urb stopped: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.674213] pl2303 ttyUSB0: pl2303_set_control_lines - failed: -32
Aug 9 10:09:56 raspberrypi kernel: [ 4348.675069] pl2303 ttyUSB0: error sending break = -32```

Any thoughts on what the issue is?

I am not having this problem on ubuntu 18.04 on an x86 system.

Thanks!

[ambush276]

nobody has this issue.

Ubuntu 18.04 kernel 4.15 pl2303 works fine. This seems to be an issue on my rpi 4 kernel: 4.19.57-v7l+


Any other devices/drivers that work?

CP2102 does not work either but those things are garbage.

[ambush276]

any experience with ftdi or other adapters ?

[jdb]

Are you using latest kernel/firmware?