On Fri, Nov 23, 2018 at 04:19:49AM +0100, Florian Zumbiehl wrote: > Hi, > > > T: Bus=01 Lev=02 Prnt=03 Port=01 Cnt=01 Dev#= 4 Spd=12 MxCh= 0 > > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > > P: Vendor=0557 ProdID=2008 Rev=03.00 > > S: Manufacturer=Prolific Technology Inc. > > S: Product=USB-Serial Controller D > > C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA > > I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303 > > > > and > > > > T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#= 6 Spd=12 MxCh= 0 > > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > > P: Vendor=067b ProdID=2303 Rev=04.00 > > S: Manufacturer=Prolific Technology Inc. > > S: Product=USB-Serial Controller D > > C: #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=100mA > > I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303 > > The ones that I have at hand all look like this: > > T: Bus=05 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 3 Spd=12 MxCh= 0 > D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > P: Vendor=067b ProdID=2303 Rev=03.00 > S: Manufacturer=Prolific Technology Inc. > S: Product=USB-Serial Controller > C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA > I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303 > > So, yours and mine are all type 'HX' according to the driver's > categorization ... > > The only common differences would be the product description string having a > "D" suffix in your version and bmAttributes being 0xa0 vs. 0x80, so yours > claim to support remote wakeup. The former seems like a bad idea to base > hardware detection on, but the latter might indicate a different chip with > different features?! > > Can you tell what the physical chip is labeled as, if anything? > > @Johan: What does the USB device info of your adapter(s) say? Almost the same as Jarkko's second device: T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=067b ProdID=2303 Rev=04.00 S: Manufacturer=Prolific Technology Inc. S: Product=USB-Serial Controller D C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=pl2303 The only difference appears to be bmAttributes not having Remote Wakeup set. I also just confirmed that my device works fine as console and with a (busybox) getty running. I can stop and start the flow using stop and star chars and disabling IXON transmits any buffered chars while stopped. Jarkko, does software flow control work if you run a terminal program instead of a getty? And could you try enabling debugging for pl2303 so we can see what commands are sent when your getty is started? And what is the output of stty -a -F /dev/ttyUSB0 when the getty has been started? Thanks, Johan
