From 429c346b8191c76cae451f1a5c590cffc2125ef2 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 19 Aug 2011 08:30:53 +0200
Subject: [PATCH] --- yaml --- r: 270412 b: refs/heads/master c:
 9fcd0ab130579d9742538340edda3225f2b49a3e h: refs/heads/master v: v3

---
 [refs]                  |  2 +-
 trunk/sound/usb/mixer.c | 13 +++++++++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 79b98da6b212..72ad83e00284 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b55ac2a116e2b0bb2293873c290751cc17099022
+refs/heads/master: 9fcd0ab130579d9742538340edda3225f2b49a3e
diff --git a/trunk/sound/usb/mixer.c b/trunk/sound/usb/mixer.c
index cdd19d7fe500..78a5abda6793 100644
--- a/trunk/sound/usb/mixer.c
+++ b/trunk/sound/usb/mixer.c
@@ -881,8 +881,17 @@ static int mixer_ctl_feature_info(struct snd_kcontrol *kcontrol, struct snd_ctl_
 		uinfo->value.integer.min = 0;
 		uinfo->value.integer.max = 1;
 	} else {
-		if (! cval->initialized)
-			get_min_max(cval,  0);
+		if (!cval->initialized) {
+			get_min_max(cval, 0);
+			if (cval->initialized && cval->dBmin >= cval->dBmax) {
+				kcontrol->vd[0].access &= 
+					~(SNDRV_CTL_ELEM_ACCESS_TLV_READ |
+					  SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK);
+				snd_ctl_notify(cval->mixer->chip->card,
+					       SNDRV_CTL_EVENT_MASK_INFO,
+					       &kcontrol->id);
+			}
+		}
 		uinfo->value.integer.min = 0;
 		uinfo->value.integer.max =
 			(cval->max - cval->min + cval->res - 1) / cval->res;