alsa "underrun occured", causes (?) fps drop

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The game runs perfectly for about 10 seconds, then fps drop to about 30. The 
console also gives a few "ALSA lib pcm.c:7223:(snd_pcm_recover) underrun occured
" errors.

Fps will go up again to 60 if I go back to the menu (but not if I just "retry" 
another game).

I am running debian stable (squeeze), and using the sdl script (other do not 
work at all).
I had to install libsdl-mixer1.2 and libsdl-ttf2.0-0.

This happens with 7.5.0, and also with 7.0.0 (didn't check others). There was 
no such problem before upgrading debian to squeeze (though I don't remember if 
the snd_pcm problem was already there).

Hope this helps, as the game is unplayable for me now. 

Original issue reported on code.google.com by alexis.g...@gmail.com on 22 Oct 2011 at 3:30

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Please stop using SDL version. It's Java library SDLJava is heavily outdated 
and I'm sure that recent Debian's sound system update broke the compatibility 
with SDLJava.
So, please buy better graphics card to run Slick version, or wait until we 
release a new version of NullpoMino.

Original comment by pbomqlu910963@gmail.com on 23 Oct 2011 at 5:26

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The reason I used sdl are the numerous issues I have with the slick version. 
See issue 81:http://code.google.com/p/nullpomino/issues/detail?id=81
Swing version is worse (cannot play at all).

It seems unlikely that a better graphic card would do any good (had the same 
issue with an integrated intel card and an nvidia one (with direct rendering 
working and 17k fps in glxgears)).

Let me also take this occasion to thank all the devs for this great game 
(notwithstanding these few quirks).

Original comment by alexis.g...@gmail.com on 25 Oct 2011 at 1:17