Regarding acceleration, does the X11 mouse pointer on your desktop behave the way you expect? MAME and SDL just read what X11 does, they don't do any trickerations with the data.
> For SDL, MAME seems to requrie "SDL_MOUSE_RELATIVE=1" in order to have correct mouse > movements, otherwise invisible walls will occur.
You should not require that setting assuming you are running MAME full screen. And using it with MAME is not really supported; we want to do our own relative/absolute handling internally to facilitate proper game compatibility.
For the record, Linux/Mac support is formally here; everyone on mameworld runs Windows.
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