I have a similar problem on the same hardware: IDT 92HD91BXX on a dell 14z inspiron 5423 ultrabook. Instead of no sound, white noise is continuously emitted from the sound card (only from speakers, never when using headphones). Other people seem to be affected, as documented in this Ubuntu forum thread:
http://ubuntuforums.org/showthread.php?p=12356165 After some experimenting I found a workaround and posted it as an answer to a question on askubuntu.com: http://askubuntu.com/questions/192185/12-04-dell-14z-inspiron-5423 -ultrabook-sound-noise/217672 . I hope it can help debugging the issue. I attach the python script I use for getting rid of the white noise at boot. ** Attachment added: "A python script that eliminates the white noise on IDT 92HD91BXX" https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/888703/+attachment/3434554/+files/fix-idt-codec -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/888703 Title: [320-1020m, IDT 92HD91BXX, Speaker, Front] Playback problem To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/888703/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
