Once again: no. The original reporter says that when he plugs the pl2303 device directly into
the USB2.0 hub, it works just fine. It's only when it goes through a USB1.1 dock/hub that it
So, once again: YOU ARE TALKING ABOUT SOMETHING COMPLETELY DIFFERENT FROM THE LINK YOU POSTED.
Most people aren't seeing the problem because most USB1.1 devices work just fine in USB2.0
hubs. The problem described in the link you supplied is a corner case (some weird built-in
serial adapter in a hub/dock thingy). The problem you've described sounds like it's specific
to some portion of your hardware.
I dug through my hardware pile and found a pl2303. It works just fine in a USB2.0 port. If
you want to moan about how depressing kernel development is, that's fine; but claiming that
it's hopeless when you refuse to get involved is just silly.