From 4d20bb1d5fe1afbdbff951c06cd3d3654fa5ceed Mon Sep 17 00:00:00 2001
From: Raymond Yau <superquad.vortex2@gmail.com>
Date: Tue, 17 Jan 2012 11:41:47 +0800
Subject: [PATCH] ALSA: ymfpci - Don't create invalid PCM & mixers when AC97
 doesn't support

- check SDAC bit of AC97 primary codec when create "rear" device 3,
  "4ch" device 2 and "4ch Duplication" switch as the card need a four channels
  AC97 codec to support surround40.

Signed-off-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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