there was a patch

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_via.c?id=bc9b56238eedda865070dcaed6694d65b517c8d6

[ALSA] hda - Fix noise on VT1708 codec
We get quite noisy output on the right channel on VT1708 codec when 24bit 
samples are used. Suppress the 24bit support until any real fix is found.


seem the limitation seem removed by this patch ALSA: hda - Use generic parser 
for VIA codec driver


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_via.c?id=b3f6008f2d511133e0f04782c437a13b6865d26b


-static const struct hda_pcm_stream vt1708_pcm_analog_s16_playback = {
- .substreams = 1,
- .channels_min = 2,
- .channels_max = 8,
- /* NID is set in via_build_pcms */
- /* We got noisy outputs on the right channel on VT1708 when
- * 24bit samples are used. Until any workaround is found,
- * disable the 24bit format, so far.
- */
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- .ops = {
- .open = via_playback_multi_pcm_open,
- .close = via_playback_multi_pcm_close,
- .prepare = via_playback_multi_pcm_prepare,
- .cleanup = via_playback_multi_pcm_cleanup
- },
-};

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https://bugs.launchpad.net/bugs/1225789

Title:
   [FUJITSU AMILO La1703 audio playback] Audio volume extremely low

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