Theory is that /etc/init.d/gpm first sources /etc/sysconfig/mouse and
starts inputattach reading events from the real device sending them to
/dev/input/mice then sourcing /etc/sysconfig/gpm changing $DEVICE and
$MOUSETYPE for reading from /dev/input/mice.
/etc/init.d/gpm from gpm-1.20.1-57 sources both /etc/sysconfig/mouse
and /etc/sysconfig/gpm at startup causing inputattach to read from
current version does away with /etc/sysconfig/gpm (does not detect it
or load it). sources /etc/sysconfig/mouse only (if it exists), then
fills in the MOUSETYPE and the DEVICE only if they have not already
been set by /etc/sysconfig/mouse, giving it the preference.