Hi! I noticed on your page (http://www.sane-project.org/unsupported/lexmark-x1150.html) the Lexmark x1150 is listed as "not supported" and the comments section says "At least the Lexmark X1185 is now supported by the lexmark backend. Maybe the other X11.. scanners also work? Please tell us about your results."
I have just tried to use a Lexmark X1150 with SANE (sane-backends-1.0.19 and xsane 0.996) and am happy to report that everything seems to be working perfectly! Thank you! :-) Kristen