may be you can differentiate v7900 and v7912 by codec ssid ?

Codec: Realtek ALC260
Address: 0
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x10ec0260
Subsystem Id: 0x16311635
Revision Id: 0x100400

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https://bugs.launchpad.net/bugs/1078317

Title:
  No sound on headphones or internal speakers: PB EasyNote, Realtek
  ALC260

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