you should send email to both Massimo Del Fedele and Tiwai
and ask Massimo Del Fedele whether his g75 still working with latest alsa driver
since there is a number of changes which affect g75 after he add support of g75
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/hda_codec.c?id=cd4035e814b04c009ece9939396d06370c53ed44
ALSA: hda - Enable surround speakers (when line out is also present)
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_via.c?id=b3f6008f2d511133e0f04782c437a13b6865d26b
ALSA: hda - Use generic parser for VIA codec driver
you should send email to both Massimo Del Fedele and Tiwai
and ask Massimo Del Fedele whether his g75 still working with latest alsa driver
since there is a number of changes which affect g75 after he add support of g75
https:/ /git.kernel. org/cgit/ linux/kernel/ git/tiwai/ sound.git/ commit/ sound/pci/ hda/hda_ codec.c? id=cd4035e814b0 4c009ece9939396 d06370c53ed44
ALSA: hda - Enable surround speakers (when line out is also present)
https:/ /git.kernel. org/cgit/ linux/kernel/ git/tiwai/ sound.git/ commit/ sound/pci/ hda/patch_ via.c?id= b3f6008f2d51113 3e0f04782c437a1 3b6865d26b
ALSA: hda - Use generic parser for VIA codec driver