This has been tested with live ubuntu 19.10 as suggested by Daniel and
the mouse problem persists for intel braswell. xdotool reveals that X
reports a vertical position of zero, even when the mouse is painted with
an offset to the right, which seems to indicate this is could be a
compositor problem
To those of you who are concerned with this message '/etc/modprobe.d is
not a file', note that this message does not reflect an error. It is
simply a wrongly placed and mis-worded message in function
"is_module_blacklisted" in gpu-manager.c However, this does not address
the situation of incorrectl
