I have just switched from OpenSuse to Ubuntu (the only reason is poor repositories - I got tired of installing everything from tar-balls). OpenSuse KDE worked flawlessly. Off-topic OS 7 does too.

However, Ubuntu 13.04 after all updates keeps freezing about every minute. The time differs between occasions. It halts just for a fraction of a second, too quick to notice, but music crackles, and compressed video looses its tracks and covers with errors until a scenecut.

I don't know what is responsible, the logs are clear.

Tried to:

• change audio card,
• switched to Nvidia drivers and back,
• paused all unneeded daemons.

Didn't help much.

Any ideas where to look? I am experienced in Linux, just new in Ubuntu.