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Re: Crackling sound in games, pulseaudio CPU usage high (F10)

On Monday 01 December 2008 15:13, NM wrote:
> Couldn't find info about this anywhere, but I have this really annoying
> problem, whereby in games, be they ETQW (full version) or games included
> in the stock Fedora distrib, have very bad sound quality. Lots of
> crackling. The CPU usage of pulseaudio shoots up to 20% (that's on a dual
> core Pentium D).

Do you have the same sound problems when playing an audio cd, or playing music 
files (.ogg, .mp3)?
> I can get normal perf. with ETQW by using pasuspend and forcing output to
> hw:0, but there's got to be a better solution.

If it is Pulseaudio causing the problem, and you don't use it for anything 
specific, you could just disable it by removing the package 
alsa-plugins-pulseaudio. If you are using KDE like me, this will also remove 
the package kde-settings-pulseaudio. By doing this your audio apps will 
revert to using Alsa directly. If any of the games you play use SDL, you will 
need to add the following line to /home/<user>/.bashrc , which will remove 
the hack that SDL programs need to use Pulseaudio.


> This is my sound card:
> 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
> Controller (rev 02)
> [root ws log]# grep -i hda dmesg
> HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
> HDA Intel 0000:00:1b.0: setting latency timer to 64
> hda_codec: Unknown model for ALC883, trying auto-probe from BIOS...
> ALSA sound/pci/hda/hda_codec.c:3021: autoconfig: line_outs=4
> (0x14/0x15/0x16/0x17/0x0)
> ALSA sound/pci/hda/hda_codec.c:3025:    speaker_outs=0
> (0x0/0x0/0x0/0x0/0x0)
> ALSA sound/pci/hda/hda_codec.c:3029:    hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
> ALSA sound/pci/hda/hda_codec.c:3030:    mono: mono_out=0x0
> ALSA sound/pci/hda/hda_codec.c:3038:    inputs: mic=0x18, fmic=0x19,
> line=0x1a, fline=0x0, cd=0x0, aux=0x0

What is the make and model of your Laptop/PC ?

Can you post the output from the following commands.

cat /proc/asound/version
grep ^Codec /proc/asound/card?/codec*
/sbin/lspci -vn             (just the bit for the soundcard)

Did the sound just work ok post install of F10, or did you have to set model 
options for snd-hda-intel?

There are a whole bunch of model options for the ALC883 codec, some of which 
may give you more sliders/controls in alsamixer, when run as user in a 
terminal. To see all the controls when pulseaudio is enabled, you will have 
to open alsamixer as below, otherwise you will only see one control for 

alsamixer -D hw:0

Crackling sounds can be a problem to resolve. I know that pulseaudio can be 
responsible for low volume output, and if you are having to push the volume 
up to 100% to get decent sound levels to your speakers, it could be that the 
card is being pushed beyong it's capabilities. It's interesting that when you 
don't use pulseaudio, the sound is ok.

I'll give you a list of model options when you post back, but I need to know 
the alsa driver version, that's on F10 first.

All the best.


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