Disapearing pl2303 usb serial adapter on rpi2

[bob prohaska]

On Fri, Dec 22, 2017 at 09:39:30PM +0100, Hans Petter Selasky wrote:
> I'm interested in messages containing wPortChange= , but with a non-zero 
> value afterwards.
> 

Ok, that I can understand 8-)

Right now the system is running with
root at www:/home/bob # sysctl hw.usb.uhub.debug=17
hw.usb.uhub.debug: 0 -> 17
root at www:/home/bob # sysctl hw.usb.no_cs_fail=1
hw.usb.no_cs_fail: 0 -> 1

There's a steady stream of lines like 
uhub_read_port_status: port 3, wPortStatus=0x0100, wPortChange=0x0000, err=USB_ERR_NORMAL_COMPLETION
uhub_read_port_status: port 5, wPortStatus=0x0103, wPortChange=0x0000, err=USB_ERR_NORMAL_COMPLETION
scrolling up the serial console.

Does the command
hw.usb.no_cs_fail: 0 -> 1 imply the output will stop (or at least slow
down) once the pl2303 freezes? 

Thanks very much!

bob prohaska