@David, for my case it didn't change anything, after installing your patch and removing model line only 2 of 5 speakers working, after adding model line none of them.
Maybe this will tell you something:

[   31.910296] ALSA: hda_intel.c: You're running a customized HDA driver, installed by DKMS. The packaging was made by <email address hidden>.
[   31.910362]   alloc irq_desc for 22 on node -1
[   31.910364]   alloc kstat_irqs on node -1
[   31.910371] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
[   31.910438]   alloc irq_desc for 46 on node -1
[   31.910440]   alloc kstat_irqs on node -1
[   31.910453] HDA Intel 0000:00:1b.0: irq 46 for MSI/MSI-X
[   31.910487] HDA Intel 0000:00:1b.0: setting latency timer to 64
[   31.910492] ALSA-HDA hda_intel.c:2515: chipset global capabilities = 0x4401
[   31.990029] ALSA-HDA hda_intel.c:908: codec_mask = 0xb
[   31.990117] ALSA-HDA hda_intel.c:1343: codec #0 probed OK
[   31.990156] ALSA-HDA hda_intel.c:1343: codec #1 probed OK
[   31.990200] ALSA-HDA hda_intel.c:1343: codec #3 probed OK
[   32.136918] hda_codec: ALC888: SKU not ready 0x598301f0
[   32.136981] ALSA-HDA hda_codec.c:3692: hda_codec: model 'lenovo-sky' is selected
[   32.639843] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_get_connections
[   32.639847] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_get_connections (err -22)
[   32.639917] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_codec_read
[   32.639919] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_codec_read (err -22)
[   32.639988] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_delete_codec_preset
[   32.639991] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_delete_codec_preset (err -22)
[   32.640100] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_eld_proc_free (err 0)
[   32.640168] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_multi_out_dig_open
[   32.640171] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_multi_out_dig_open (err -22)
[   32.640248] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_get_sub_nodes
[   32.640250] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_get_sub_nodes (err -22)
[   32.640320] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_multi_out_dig_close
[   32.640322] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_multi_out_dig_close (err -22)
[   32.640391] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_sequence_write
[   32.640393] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_sequence_write (err -22)
[   32.640467] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_codec_write
[   32.640469] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_codec_write (err -22)
[   32.640539] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_add_codec_preset
[   32.640542] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_add_codec_preset (err -22)
[   32.640626] snd_hda_codec_nvhdmi: Unknown symbol snd_print_channel_allocation (err 0)
[   32.640703] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_pin_sense
[   32.640705] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_pin_sense (err -22)
[   32.640787] snd_hda_codec_nvhdmi: Unknown symbol snd_hdmi_show_eld (err 0)
[   32.640859] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_create_spdif_out_ctls
[   32.640861] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_create_spdif_out_ctls (err -22)
[   32.640937] snd_hda_codec_nvhdmi: disagrees about version of symbol snd_hda_multi_out_dig_prepare
[   32.640939] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_multi_out_dig_prepare (err -22)
[   32.641021] snd_hda_codec_nvhdmi: Unknown symbol snd_hda_eld_proc_new (err 0)
[   32.641103] snd_hda_codec_nvhdmi: Unknown symbol snd_hdmi_get_eld (err 0)
[   32.928557] ALSA-HDA hda_codec.c:2145: Cannot find slave Headphone Playback Volume, skipped
[   32.928562] ALSA-HDA hda_codec.c:2145: Cannot find slave Speaker Playback Volume, skipped
[   32.928565] ALSA-HDA hda_codec.c:2145: Cannot find slave Mono Playback Volume, skipped
[   32.928568] ALSA-HDA hda_codec.c:2145: Cannot find slave Line-Out Playback Volume, skipped
[   32.928571] ALSA-HDA hda_codec.c:2145: Cannot find slave PCM Playback Volume, skipped
[   32.928583] ALSA-HDA hda_codec.c:2145: Cannot find slave Headphone Playback Switch, skipped
[   32.928586] ALSA-HDA hda_codec.c:2145: Cannot find slave Speaker Playback Switch, skipped
[   32.928589] ALSA-HDA hda_codec.c:2145: Cannot find slave Mono Playback Switch, skipped
[   32.928593] ALSA-HDA hda_codec.c:2145: Cannot find slave Line-Out Playback Switch, skipped
[   32.928595] ALSA-HDA hda_codec.c:2145: Cannot find slave PCM Playback Switch, skipped