[Openal] OpenAL 1.1 alcOpenDevice() fails with Dell M90, WinXP, SigmaTel audio

[Ville Herva]

It seems not possible to get alcOpenDevice() working on
 Dell M90
 Windows XP SP2
 SigmaTel driver 10.2.2006 5.10.0.4943
 SIGMATEL STAC 92XX C-Major HD Audio

alcOpenDevice() always returns NULL (alcGetError() is not defined in this
case, though I did try alcGetError(NULL)).

I tried alcOpenDevice("DirectSound3D"), alcOpenDevice("DirectSound") and
alcOpenDevice("MMSOUND") explicitly and alcOpenDevice(NULL).

On several other Windows XP systems, the code seems to work just fine.

Any idea how to get it working (even without any hw acceleration)?