Bug 825898 - sound output is now crackling unbearably
sound output is now crackling unbearably
Product: Fedora
Classification: Fedora
Component: alsa-plugins (Show other bugs)
i686 Linux
unspecified Severity high
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-05-28 22:10 EDT by Brad
Modified: 2013-01-22 23:22 EST (History)
12 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-01-22 23:22:49 EST
Type: Bug
Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
output of pulseaudio -vvvvv while crackling is occurring. (86.13 KB, application/octet-stream)
2012-05-28 22:10 EDT, Brad
no flags Details

  None (edit)
Description Brad 2012-05-28 22:10:34 EDT
Created attachment 587299 [details]
output of pulseaudio -vvvvv while  crackling is occurring.

Description of problem:
Sounds, such as the skype audio, are crackly and indecipherable.

Version-Release number of selected component (if applicable):

How reproducible:
Start an audio program such as skype.  Startup sound and subsequent audio are
all crackly.

Additional info:
pulseaudio -vvvvv reports lots of underruns while the crackling occurs.

Killing pulseaudio and running skype against the alsa drivers directly works fine.

This regressed in the past month or so.  It was working fine earlier in the the F16 release stream.

Asus EEE PC 1201N

# lspci -v -s 00:08.0
00:08.0 Audio device: nVidia Corporation MCP79 High Definition Audio (rev b1)
	Subsystem: ASUSTeK Computer Inc. Device 83ce
	Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 23
	Memory at f9f78000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [44] Power Management version 2
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd-hda-intel

# lsmod | grep snd_hda
snd_hda_codec_hdmi     31469  1 
snd_hda_codec_realtek   121580  1 
snd_hda_intel          32323  0 
snd_hda_codec         102795  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13236  1 snd_hda_codec
snd_pcm                81170  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd                    62853  9 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer
snd_page_alloc         13709  2 snd_hda_intel,snd_pcm
Comment 1 Brad 2012-06-13 11:34:47 EDT
I am noticing that my laptop CPU (Intel Atom) is now automatically being clocked down from 1.6GHz to 600MHz quite often; I presume this is in response to a thermal signal.  My understanding is that this is new behavior with recently implemented kernel-side frequency scaling.  At the slower clockspeed, pulseaudio becomes unusable in the way I report in this bug.

So I'm willing to chalk this bug up to the new cpu scaling system, and thermal sensitivity on my laptop.
Comment 2 Brendan Jones 2012-06-15 05:36:53 EDT
assigning to kernel
Comment 3 Sebastian Krämer 2012-06-15 06:45:44 EDT
I removed .pulse/ (with files from a previous installation, eventually!) and haven't had any issues since. (It's only a few days ago so I'm not sure if that will work for anyone else and if this bug is about the same crackling sound I was experiencing. Anyhow, it might be worth a try.)
Comment 4 Josh Boyer 2012-09-17 14:29:35 EDT
Are you still seeing this with the 3.4 or 3.5 kernel updates?  If so, does the suggestion in comment #3 help?
Comment 5 Evgeny F 2012-10-18 20:17:23 EDT
I am seeing this bug with 3.6.1-1.fc17.x86_64 kernel. Restarting pulseaudio daemon helps for a time. Strangely sometimes the problem is present in VLC but not in Dragon player. After pulseaudio restart VLC works fine too.
Comment 6 Dan Mashal 2012-10-22 23:04:01 EDT
Try "yum remove alsa-plugins-pulseaudio" and open the mixer and change the default device.
Comment 7 Fedora End Of Life 2013-01-16 09:33:17 EST
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