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 4.0-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-4.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7d1b6e29327428993ba568bdd8c66734070f45e0 Mon Sep 17 00:00:00 2001
From: David Henningsson <david.henningsson@xxxxxxxxxxxxx>
Date: Tue, 21 Apr 2015 10:48:46 +0200
Subject: ALSA: hda - fix "num_steps = 0" error on ALC256
From: David Henningsson <david.henningsson@xxxxxxxxxxxxx>
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).
BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1446517
Signed-off-by: David Henningsson <david.henningsson@xxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/hda/patch_realtek.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -5565,6 +5565,7 @@ 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;
}
@@ -5578,8 +5579,8 @@ 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 david.henningsson@xxxxxxxxxxxxx are
queue-4.0/alsa-hda-fix-num_steps-0-error-on-alc256.patch
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