i have an Acer laptop also (travelmate 250) with an i810 on board sound. The problem also occured in mdk 10CE (no problem with the 9.x version), no sound from the built in speaker. But i tried to fix this problem by editing the /etc/modules.conf file.
look for a line like this:
Code:
alias sound-slot-0 snd-xxxxx
replace the snd-xxx (ALSA driver for your soundcard) with OSS driver. In my case, i replaced it with i810_audio, so it would be read:
Code:
alias sound-slot-0 i810_audio
hope that helps