I believe this is fixed in ALSA kernel module 1.0.25 (note: vt1718s =
vt2020)

    - ALSA: hda - Fix issue that front can't output sound for VT1718S 
    For VT1718S, Mixer 9 doesn't expose the connection to DAC 0. So when 
    building up a 'PCM Playback' amplifier control, it will fail since 
    getting DAC 0 index of Mixer 9 returned -1.
-- 
http://www.alsa-project.org/main/index.php/Detailed_HDA_changes_v1.0.24_v1.0.25

You can try the latest kernel module:
https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

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https://bugs.launchpad.net/bugs/997125

Title:
  [G41MT-S2P, VIA VT2020, Green Headphone Out, Front] No sound at all

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