On Tue, Jun 25, 2013 at 07:12:28PM +0200, Karsten Malcher wrote: > Am 25.06.2013 18:54, schrieb Johan Hovold: > > 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? > > Maybe Aric can explain it better? > > I only see several problems to use a PL-2303 HX with newer kernels. > > > 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). > > The only solution i see is to give up any PL-2303 HX device like Aric. > But the problems for other users will remain ... Only if the hardware is actually broken, of course. I'm just saying that it looks like two different (hw related) problems here. > > 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. > > I remember a similar discussion on not reliable usb connectors with > external hdd's. > This connectors are often produced cheap and the connection is not > reliable each time after plugin. > > When you argue that you must forget each device or hardware in case of > an error, you can forgot much usb devices using > with Linux. > (In fact windows just ignores the errors.) > My forecast is that the number of sporadic errors will increase, > specially with usb 3. Sure, if it is something that can be worked around in software without too much overhead for non-broken devices (I have only a working HX here), then we can try it. Perhaps the device you were gonna send to Greg can be used to implement such a work-around (or at least be used to determine the cause of the problem). 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
