Patch "ALSA: hda - fix "num_steps = 0" error on ALC256" has been added to the 3.19-stable tree

This is a note to let you know that I've just added the patch titled

ALSA: hda - fix "num_steps = 0" error on ALC256

to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     alsa-hda-fix-num_steps-0-error-on-alc256.patch

and it can be found in the queue-3.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: David Henningsson <[email protected]>
Date: Tue, 21 Apr 2015 10:48:46 +0200
Subject: ALSA: hda - fix "num_steps = 0" error on ALC256

From: David Henningsson <[email protected]>

commit 7d1b6e29327428993ba568bdd8c66734070f45e0 upstream.

The ALC256 does not have a mixer nid at 0x0b, and there's no loopback path (the output pins are directly connected to the DACs).

This commit fixes an "num_steps = 0 for NID=0xb (ctl = Beep Playback Volume)" error (and as a result, problems with amixer/alsamixer).

If there's pcbeep functionality, it certainly isn't controlled by setting an amp on 0x0b, so disable beep functionality (at least for now).

---
 sound/pci/hda/patch_realtek.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

@@ -5454,6 +5454,7 @@ static int patch_alc269(struct hda_codec
 		break;
 	case 0x10ec0256:
 		spec->codec_variant = ALC269_TYPE_ALC256;
+		spec->gen.mixer_nid = 0; /* ALC256 does not have any loopback mixer path */
 		break;
 	}
 

@@ -5467,8 +5468,8 @@ static int patch_alc269(struct hda_codec
 	if (err < 0)
 		goto error;
 
-	if (!spec->gen.no_analog && spec->gen.beep_nid)
-		set_beep_amp(spec, 0x0b, 0x04, HDA_INPUT);
+	if (!spec->gen.no_analog && spec->gen.beep_nid && spec->gen.mixer_nid)
+		set_beep_amp(spec, spec->gen.mixer_nid, 0x04, HDA_INPUT);
 
 	codec->patch_ops = alc_patch_ops;
 #ifdef CONFIG_PM

Patches currently in stable-queue which might be from [email protected] are

queue-3.19/alsa-hda-fix-num_steps-0-error-on-alc256.patch