I'm seeing this same issue on an EVGA X79 motherboard. I've used NrNice's work around to disable to headphone jack. I'm running Ubuntu 14.04.3 (3.19.0-28-generic #30~14.04.1-Ubuntu).
I'm seeing this same issue on an EVGA X79 motherboard. I've used NrNice's work around to disable to headphone jack. I'm running Ubuntu 14.04.3 (3.19.0-28-generic #30~14. 04.1-Ubuntu) .