I found this entry in /etc/modprobe.d/alsa-base.conf : # Power down HDA controllers after 10 idle seconds options snd-hda-intel power_save=10
When I remove it, the noise is gone. -- karmic: high-pitched noise from snd-hda-intel https://bugs.launchpad.net/bugs/382140 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
