Please keep the USB list on CC.

On Fri, Jan 08, 2021 at 08:02:36AM -0600, Joe Abbott wrote:

Thanks for the reply.

kernel version is 5.0.0-32-generic.  I've restored pl2303.ko to original.

5.0 should work as well.

Chip version is PL2303TA.

And I believe that one is supposed to be compatible with HXD.

When I loopback rs232 to pc at 150 baud it looks normal.  After
setting to 110 baud it returns at a much higher rate and scope trace looks
the same as when set to 9600 baud.

Setting up debug might be beyond my abilities unless I could find a good
how-to that I could follow.

You can either use debugfs:

	echo module pl2303 +p > /sys/kernel/debug/dynamic_debug/control

or provide an argument to modprobe:

	modprobe pl2303 dyndbg==p

Then just check demsg after calling stty (110 evenp).

I'll look into capturing some windows packets at 110 and 9600.

Sounds good.

Johan