[solved] audio errors using qemu-kvm

[disperato]

Hi everyone, I'm having this trouble with qemu-kvm.
A long ago, I used to get sound from kvm with SDL as library and es1370 as sound card. After a major upgrade of world, whilst everything else works fine, when I try starting the virtual machine (from terminal), it yelds:

[disperato]

well, it turned up that something in my alsa configuration was wrong, and that effects of misconfiguration had been triggered by a kernel upgrade from 2.6.32-r24 to 3.2.12.

Here is the full story ([solved] Could not open playback device 'default'):
https://forums.gentoo.org/viewtopic-t-920572-highlight-.html

while the solution (I admit, extreme and noobish) was just as follows:

emerge --unmerge alsa-headers alsa-lib alsa-utils alsa-oss
cd
#backup:
mv /var/lib/alsa var_lib_alsa
emerge alsa-oss alsa-utils --keep-going --quiet-build
#this pulled in alsa-headers along with alsa-lib

and mplayer started working without errors, while playing better than before (reasonable volume response to settings).

As for the virtual machine, in the script that launches it, there was no more need of setting environment variables, while before I had to set the appropriate combination in the following:
#SDL_AUDIODRIVER=alsa
#AUDIODEV=hw
#QEMU_AUDIO_DRV=sdl
#QEMU_AUDIO_DRV=alsa
#QEMU_SDL_SAMPLES=2048
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