[alsa-devel] No headphone output on HT Omega Claro Halo

I have an HT Omega Claro Halo (CMI8878) card that is not entirely working. This card has two analog outputs, a pair of RCA connectors and also a separate headphone output (3.5mm jack). The RCA outputs work, but the headphone output, which notably passes a signal from a built in headphone amp, does not. Interestingly, when I turn up the master volume really high, I can hear pops/cracks on the headphone output. Thanks for any assistance.

-- Kristoff