Hmm, I'm unduplicating due to the last comment:

"David: These are labelled with a headphone on my laptop (see
h20424.www2.hp.com/program/cnb/kr/ko/resources/dv7-new-brochure.pdf) It
has the same headphone symbol as on page 3. Page 4 clearly labels it as
having 2 headphone jacks and 1 microphone jack."

According to your BIOS, these are the jacks you have:

Node 0x0b: [Jack] Mic at Ext Front
Node 0x0f: [Jack] Line Out at Ext Front
Node 0x1e: [Jack] SPDIF Out at Ext Front
...and internal mic and speakers. 

I'm wondering if you really have two headphone jacks, maybe one of them
is digital out / spdif only?

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https://bugs.launchpad.net/bugs/870360

Title:
  [HP Pavilion dv7 Notebook PC, IDT 92HD75B3X5, Internal] Speakers not
  disabled when headphone jack plugged in

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