Delete snd-hda-intel.conf, SB2 works correctly without it nowadays.

root/etc/modprobe.d/snd-hda-intel.conf

@@ -1,3 +0,0 @@
-options snd-hda-intel single_cmd=1
-options snd-hda-intel probe_mask=1
-options snd-hda-intel model=basic