Nasty bug! Already reported but i didn’t find a real solution. However reinstalling amarok seems to work… UPDATE I No, it didn’t work. Changed to rythmbox. Still looking for a solution. UPDATE II This seems to work.
In the past few days i experienced that my sound-system was somehow messed up after some time. And I’m pretty sure, that the firefox flash plugin has something to do with it. However the quick-and-dirty fix is to reload the sound system. sudo alsa force-reload This will reload all necessary sound-modules.
If you experience screen flickering at random times you can try adding options nvidia_new NVreg_Mobile=1 NVreg_RegistryDwords=”PerfLevelSrc=0x2222″ (for copy&paste check the “) to /etc/modprobe.d/nvidia-kernel-nkc (Ubuntu) in order to fix some timer problems between the driver and compiz-fusion. It took me a long time to finally see this solution here: http://www.nvnews.net/vbulletin/showthread.php?t=87692