I recently purchased a refurbished ASUS Q400A-BIH7N03 and of course wiped Windows 8 off it and immediately installed Ubuntu 13.10. Everything is working great except for when I plug headphones into the headphone jack. The sound appears to be heavily distorted. When I play around with the "Test Audio" buttons in the audio configuration (I believe the default on Ubuntu is PulseAudio these days?) I can hear sound in both headphones whether I click the "Test Left Speaker" or "Test Right Speaker" button. If I adjust the balance slider all the way to the left, the distortion is gone and I can clearly hear the left channel in both headphones. Not exactly ideal for listening to music.
Has anyone else had a similar problem or know how to fix this?
Alsa says my Codec is: Realtek ALC270, if that helps.
Thanks in advance!