On Mon, Jun 24, 2013 at 10:41:07AM +0200, Karsten Malcher wrote: > Hello Greg, > > have you buyed one of this jinxed PL-2303 HX adapters? > > Yesterday i got this interesting mail from Aric, who has analyzed a > similar problem with this chip. Why do you think that this is related to the problems you were experiencing back in April? Your logs contained indications of hardware errors: usb_serial_generic_read_bulk_callback - nonzero read bulk status received: -84 which are not present in Aric's logs. His stackoverflow post > http://stackoverflow.com/questions/16832281/strange-bit-shifting-when-pl2303-connected-to-cp210x also describes a different problem (odd bitshifts and inversions rather than dropped data due to detected hw errors). Specifically, no data is lost in Aric's case, rather it appears to be received garbled. > I think something went wrong in the usb serial handling, but not in > the driver itself. > But the error is really complicate to figure out in the depth of the > software. > > The really annoying thing is that it worked with kernel 2.6.32. Just to be clear, that's your setup. AFAICT Aric never got his setup to work with any kernel (but for a brief period with the same 3.0 kernel). As we discussed in April, there has been a lot of changes (including performance improvements) made to the pl2303 driver since 2.6.32 which could possibly explain why you did not trigger your (suspected) hw error on really old kernels. Thanks, Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
