This is the same as SMX_SetLights, but instead of taking one buffer with a
fixed size, it takes a separate buffer for each pad, and explicitly includes
the size of the buffer rather than assuming it's 864 bytes. SMX_SetLights
and SMX_SetLights2 call into the same underlying update.
This fixes the default always being up-left (which is usually disabled),
causing the color slider to not do anything until you select a different
panel.
This improves recovery if a start packet is received when we didn't receive a complete
packet earlier. This doesn't normally happen, this just matches the error recovery used
in game.
Having this at 5 is causing confusion, since the hardware isn't actually designed
to have the thresholds so close together. This was set to 5 for internal testing,
but it's not actually useful to have them so close together. The thresholds exist
to prevent ghosting and strobing on the panels, and putting the thresholds very
close together prevents them from doing that.
This caused SMXConfig to think it was setting both controller configurations even
when only one was connected, which made the UI not refresh correctly if only P2
was connected.
Glenn Maynard