Pulse

In Debian squeeze videos played in the Adobe flash player had no sound.
A solution - activate the virtual "Pulse" audio driver and make it to be the default.
To do that, create file /etc/asound.conf or ~/.asoundrc with the following content:

pcm.pulse {
type pulse
}

ctl.pulse {
type pulse
}

Output jack slim

Put a new build of Android, connected headphones - audio output works.
Apparently it worked before.
But I did not know the difference: the output starts not instantly when you put the jack in, but when the media process starts to play a new song. It checks the connector in the begining of the playback.