This looks like a configuration problem - although you've got two screen sections set up, they're not referenced by any ServerLayout section. In this case, the X server considers only the first Screen section encountered to be active.
I think that adding the following ServerLayout section will light up the SiS usb device, but I haven't tested it. Section "ServerLayout" Identifier "Dual head layout" Screen "Screen0" Screen "Screen1" RightOf "Screen0" EndSection -- Can't set monitors https://bugs.launchpad.net/bugs/610582 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs