[ubuntu] no sound with koala

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http://ubuntuforums.org – hello there, few days ago i upgraded from jaunty to karmic. everything goes well except of sound. with jaunty everything was ok, but koala remains silent no matter what i try... at first i thought it was problem with codecs as ogg files were played ok, but after installing ffmpeg, and other codec packcages there was no sound at all. anyway problem is, that if i play any song or movie it looks like there is no problem, even alsa output meter is showing, that sound is played and speakers are in full use, but i can hear no sound at all. i checked every volume setting i could find as rookie, but all volume settings were set to 100% . so i would really like to get any suggestions on my problem , thanks btw i have asus X51L notebook with factory hardware... (Hardware)