I've seen that the ice1724 driver (which is based on ice1712) is unable
to mmap on /dev/dsp.
The trick is to switch the order of your cards so that /dev/dsp is
attached to your ac97 on-board first, instead of your ice1712. If you
make 'alias snd-card-0 snd-intel8x0', you'll probably find the game will