I would imagine the x1155 is very similar to the discontinued x1150, which I have successfully installed on linux. The x1150 printer will work using the driver for the z605. I have never been able to get the scanner working though.
http://downloads.lexmark.com/cgi-per...e=&fileID=1151
The driver is for redhat, so it takes some tweaking to get working on other distros, but since you're running fedora it should work out of the box.