2nd attempt, as my previous mail got stuck somewhere...
i did an upgrade from 4.1 -> 4.2 at a clients site, and most of the
things seems ok, however none of the thinclients configured with serial
mouses would startup. ->
Building config file ....
++ Using Config file: "/tmp/XF86Config.1"
this is the info the client send me. ltsp.conf ( part of it ) ->
X_MOUSE_DEVICE = "/dev/ttyS0"
X_MOUSE_PROTOCOL = "Microsoft"
X_MOUSE_RESOLUTION = 50
X_MOUSE_BUTTONS = 2
X_MOUSE_BAUD = 1200