Bug#620098: [virtualbox-ose] Crash while guest screen resolution is changed (i.e. gdm started).

[Markus Hochholdinger]

I encountered the same problem. After a lot of try and error I've found out 
that changing the audio host driver from
  PulseAudio
to
  Alsa-Audio
it suddenly worked! Perhaps some sounds were played while starting X?


-- 
greetings

eMHa

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