Neil Woolford wrote:
Did you try it with plain X11 (ie. no multi-monitor extensions configured) ?
Yes, I've reverted to that for the moment. And I've reverted to 32 bit rather than 64 bit Ubuntu. Still no joy. There is however still a problem with compiling the Matrox drivers; although the 'mtx' driver is loaded, available to X11 and works, several additional kernel modules still don't compile. It is possible that the function we need is provided by one of them. (I'm fixing errors, but it's a moving target so far - maybe the current one is the last one?) There are also several versions of the Linux drivers out there, I shall be checking fordifferences.
It sounds strange. Of course, from what I see on the Xorg mailing list, a lot of strange things happen with X11 servers :-) Unfortunately, I'm not an expert on what can go wrong with them, or what works with what. Graeme Gill.