Hi, > device. The reported problems have looked like hardware issues, Probably not my case - the device works OK on a winXP box > Could you try the vendor driver and see if that makes the device work so > that we'd know for sure? Well, it was quite a job to get the driver to compile on linux 4.1.6, and I had to kludge a replacement for the deprecated interruptible_sleep_on() mechanism. I still can't believe it works (I have no kernel/module experience) but apart from an inexplicable 1-2 second delay when close()-ing the port, it works in my application (write+read with timeout; TXD-RXD connected together in a loopback) The mfg driver I used was downloaded from WCH at some point. A copy is visible on https://github.com/karlp/ch341-linux/blob/master/drivers/CH341SER_LINUX/ch34x.c And my patch to get it to compile is quite simple: http://pastebin.ca/3167353 (not sure what the diff/patch guidelines are on this list, I preferred to link) Note : I probably violate many rules of kernel coding with my use of wait_event_interruptible(). Consider this a highly unstable, incompetent patch. Regards, -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html