Just followed the instructions given by the Troubleshoot button in drakconf's 'Hardware' section:
lspcidrake -v | fgrep AUDIO for which driver is used by default:
it was i810_audio
changed to that driver.
found aumix was not installed. Installed it.
Found alsa was not running in runlevel 5. Made it run in drakconf 'Services'.
Restarted machine, opened kmix, made sure sound not muted and put to 50% volume, working fine.