Bug 530049

Summary: MMX volume adjustment code is broken
Product: [Fedora] Fedora Reporter: Michael Schwendt <bugs.michael>
Component: pulseaudioAssignee: Lennart Poettering <lpoetter>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: low    
Version: rawhideCC: dragomir.dan, joachim.backes, lkundrak, lpoetter, paul, wtogami
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2009-10-31 01:59:57 UTC Type: ---
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cat /proc/cpuinfo none

Description Michael Schwendt 2009-10-21 10:59:09 UTC 
$ play somefile.ogg

Then open "Sound Preferences" to alter the "sox" application's volume level. For anything lower than 100%, sound gets distored heavily.

Also reproducible with other audio players.

$ rpm -q pulseaudio alsa-plugins-pulseaudio
pulseaudio-0.9.19-1.fc12.i686
alsa-plugins-pulseaudio-1.0.21-2.fc12.i686
Comment 1 Lennart Poettering 2009-10-21 15:29:23 UTC 
Please provide the contents of /proc/cpuinfo!
Comment 2 Michael Schwendt 2009-10-21 15:48:27 UTC 
Created attachment 365538 [details]
cat /proc/cpuinfo
Comment 3 Michael Schwendt 2009-10-21 16:06:51 UTC 
If I let two audio apps play, distortion goes away.
Comment 4 Michael Schwendt 2009-10-21 16:45:04 UTC 
No, I was mistaken. It's only less distortion with two audio apps playing - or sometimes it seems fix itself magically. Still something's wrong with the mixing. When either app finishes, heavy distortion returns most of the time. There's an additional burst of noise (approx. 500 ms to less than 1 s) when "play" starts and stops and the volume of a 2nd app is reduced.
Comment 5 Lennart Poettering 2009-10-23 18:47:07 UTC 
OK, this seems to be a problem with the MMX volume adjustment code, which is only enabled when SSE2 is not available.
Comment 6 Lennart Poettering 2009-10-23 18:49:00 UTC 
A temporary workaround should be to set PULSE_NO_SIMD=1 when running PA. Could you please verify that?
Comment 7 Michael Schwendt 2009-10-24 10:06:36 UTC 
Confirmed.
Comment 8 Lennart Poettering 2009-10-30 04:15:41 UTC 
Now fixed upstream, will prepare an update shortly.
Comment 9 Joachim Backes 2009-11-04 17:17:26 UTC 
*** Bug 533001 has been marked as a duplicate of this bug. ***