Comment 9 for bug 1365769

smaft 5.1 was replcaed by channel mode long time ago

Simple mixer control 'Smart 5.1',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]

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