> Could it even be a problem with the usbserial layer? > Any help is really appreciated as I'm not familiar > with the USB part of the kernel!
Okay, I've collected more information: I commented out the ftdi_write/ftdi_read function pointers in ftdi_sio.c, so that the generic handler of usbserial handles the write calls. Attached you'll find the debug log of usbserial showing the same behavior. Looks like the problem is not the ftdi_sio driver, it's in an upstream layer. Any hints how I could proceed now? Thomas
usbserial_debug.gz
Description: GNU Zip compressed data
