Bug 1116646

Summary:	audio volume much lower with kernel 3.15
Product:	[Fedora] Fedora	Reporter:	Nerijus Baliūnas <nerijus>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	20	CC:	gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-09-04 21:42:28 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Nerijus Baliūnas 2014-07-06 18:01:53 UTC

# lspci|grep Audio
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02)

With kernel-3.14.9-200.fc20.i686 audio volume is OK, with kernel-3.15.3-200.fc20.i686 even when mixer volume is 100%, the sound is lower than 3.14.x kernel and mixer volume 50%.

Comment 1 Nerijus Baliūnas 2014-07-06 18:19:54 UTC

dmesg|grep -i sound does not give any output on 3.14.9-200, but on 3.15.3-200:

[   20.572292] sound hdaudioC0D0: CX20549 (Venice): BIOS auto-probing.
[   20.572559] sound hdaudioC0D0: autoconfig: line_outs=1 (0x10/0x0/0x0/0x0/0x0) type:speaker
[   20.572563] sound hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[   20.572567] sound hdaudioC0D0:    hp_outs=1 (0x11/0x0/0x0/0x0/0x0)
[   20.572570] sound hdaudioC0D0:    mono: mono_out=0x0
[   20.572574] sound hdaudioC0D0:    dig-out=0x13/0x0
[   20.572577] sound hdaudioC0D0:    inputs:
[   20.572581] sound hdaudioC0D0:      Mic=0x14
[   20.572584] sound hdaudioC0D0:      Line=0x12
[   20.572588] sound hdaudioC0D0:      CD=0x15
[   20.574077] sound hdaudioC0D0: Enable sync_write for stable communication
[   20.585615] input: HDA Intel Line as /devices/pci0000:00/0000:00:1b.0/sound/card0/input8
[   20.585819] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input9

Comment 2 Nerijus Baliūnas 2014-07-06 18:26:18 UTC

lsmod|grep snd output on 3.14.9-200:

snd_hda_codec_conexant    47818  1 
snd_hda_codec_generic    57111  1 snd_hda_codec_conexant
snd_hda_intel          42689  4 
snd_hda_codec         111410  3 snd_hda_codec_conexant,snd_hda_codec_generic,snd_hda_intel
snd_hwdep              13232  1 snd_hda_codec
snd_seq                54679  0 
snd_seq_device         13824  1 snd_seq
snd_pcm                83092  3 snd_hda_codec,snd_hda_intel
snd_timer              23750  2 snd_pcm,snd_seq
snd                    59345  16 snd_hwdep,snd_timer,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
soundcore              14123  1 snd

On 3.15.3-200:

snd_hda_codec_conexant    14314  1 
snd_hda_codec_generic    61774  1 snd_hda_codec_conexant
snd_hda_intel          29152  4 
snd_hda_controller     29171  1 snd_hda_intel
snd_hda_codec         112994  4 snd_hda_codec_conexant,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_hwdep              13232  1 snd_hda_codec
snd_seq                55888  0 
snd_seq_device         13824  1 snd_seq
snd_pcm                91968  3 snd_hda_codec,snd_hda_intel,snd_hda_controller
snd_timer              23814  2 snd_pcm,snd_seq
snd                    63701  17 snd_hwdep,snd_timer,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
soundcore              14123  2 snd,snd_hda_codec

Comment 3 Nerijus Baliūnas 2014-09-04 21:42:28 UTC

I asked in the alsa list:

It's because the volume was overloaded in 3.14 and earlier.
It came through the mixer widget and it has the gain over 0dB.
If you set 100% amp in the pin and sets more than 0dB in the mixer,
it's basically more than 100%, overloading.

That is, the new driver corrected the wrong volume setup.

Takashi