I have one as well, I had exactly the same problems.  This tip might help 
you out, I haven't had the chance to try it out.

Being that the light gun is an absolute pointing device, it is treated 
more like a Wacom tablet.  During kernel compile time, you have to give 
the screen resolution you will use for your tablets (It may also be a 
module load-time option as well, which would make more sense).  This must 
match the resolution you run at for the light gun.  I too had problems 
with the gun shooting "slightly off" and this could certainly be part 
of the cause.

Good Luck,
Brian


>I have one and I have mentioned before on this list that I've had some 
>interesting success in some areas and not so interesting results in 
>others.
>
>The OS is happy to accept the gun as a USB mouse. X will let me use 
>it. But there seems to be some positioning things that need to be 
>fixed. The mouse doesn't appear where I aim (windows does, using only 
>the standard HID drivers) But I suspect that's because there's 
>somekind of math going on. The device claims to be an absolute 
>pointing device, with a max x/y that probably needs to be mapped 
>somehow - I tried the options on the usbmouse driver to set the 
>resolution but it's always just off the the side/above/below etc.
>
>Now for the xmame problems....
>
>I have 3 mice on my PC - PS/2, serial (spinners on my controller box) 
>and the gun. The serial mouse and gun are set up as xinput devices 
>with "sendcoreevents". Works fine on the regular desktop with the 
>exception of the gun noted above.
>
>I can tell xmame to use mouse button 1 as P1 button 1, however, not 
>the light gun.
>The left/right mouse button action seems to be lost only in xmame as 
>far as input is concerned. When I pull up the menu to assign a mouse 
>button to the P1 B1 the input is still ignored only from the light 
>gun, both mice still send events. This strikes me as extremely odd, 
>since the gun is sending core events.
>
>I think mame is doing something weird - there is code in the windows 
>version that might be interfering somehow - I don't know - I haven't 
>had time to get into the source.
>
>Let me clarify this:
>when I click the left button on my ps/2 mouse, it fires a shot
>when I click on the left button on the serial mouse, it fires a shot
>when I pull the trigger on the light gun, the screen still flashes, 
>but it does not fire a shot. At all other times, the trigger will 
>function as a left mouse button (ie. on the desktop) The trigger event 
>seems to be dropped.
>
>That's where I left off last time I made the effort to play with it.
>
>Ste
>
>
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-- 
Brian Hayward


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