Bug 81209 - (SCHEDULER ?)Sound distortion on VIA 686b
(SCHEDULER ?)Sound distortion on VIA 686b
Status: CLOSED DUPLICATE of bug 100918
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
All Linux
low Severity medium
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Assigned To: Jeff Garzik
Brian Brock
Depends On:
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Reported: 2003-01-06 15:00 EST by Miloslav Trmac
Modified: 2013-07-02 22:09 EDT (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Last Closed: 2006-02-21 13:50:57 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Miloslav Trmac 2003-01-06 15:00:38 EST
Description of problem:
This is one of the bug reports that are unlikely to get fixed,
but anyhow:

Steps to Reproduce:
1. install gnome, redhat-artwork, ... (HW described below)
2. ogg123 /usr/share/redhat-credits.ogg
3. Ctrl-Alt-Shift-triple-click the desktop
Expected results: (8.0)
The sound is same in both cases, including volume and the silence at start.

Actual results:
In step 3), I hear clicking sounds at start (seem to be synchronized
with desktop redrawing). When the real music starts, it is
very distorted and LOUD.

Additional info:
driver via82cxxx_audio,
lspci gives VIA VT82C656 rev. 50, subsystem ID: ECS, unknown product 0987
Comment 1 Alan Cox 2003-01-06 17:15:43 EST
Clicking may be X traffic. Heavy video traffic on some boxes causes that.
Playing with BIOS PCI settings can sometimes help as can setting card specific
options in X.

The volume one isnt the kernel - that sounds like something is touching mixer
settings in the 
easter egg.
Comment 2 Miloslav Trmac 2003-01-07 05:26:26 EST
Sorry, I forgot to say explicitly that in RHL 8.0 there is no such problem, and redhat-credits apparently hasn't changed.
Comment 3 Havoc Pennington 2003-01-14 16:43:40 EST
Bug currently seems to be on kernel but assigned to me, I don't know 
its history but current situation makes no sense so reassigning.
Comment 4 Miloslav Trmac 2003-04-07 16:14:37 EDT
Still the same in final.
Strange thing is that starting
    ogg123 /usr/share/redhat-credigs.ogg & /usr/libexec/redhat-credits
(or starting ogg123 longer before starting redhat-credits)
results in perfect sound.
Comment 5 Alan Cox 2003-06-05 09:52:32 EDT
Looks like an O(1) scheduler interaction example
Comment 6 Warren Togami 2003-06-08 16:03:42 EDT
I think this behavior became far worse with recent (1995+) rawhide kernels,
although I am not entirely sure if this is the same behavior that I am seeing.
Comment 7 Miloslav Trmac 2003-06-09 04:01:32 EDT
FWIW, neither of these helped:
* renicing ogg123 to -20
* renicing ogg123 and esd to -20
* the above + renicing redhat-credits to +19
* the above + renicing X to +19

Swhat is a sound card supposed to do if it doesn't get data?
Is it supposed to
* be silent
* repeat last sample
* output random noise

What I actually get is quite different from (cat /dev/urandom > /dev/dsp),
(most noticeable are regular clicks), but it is certainly not similar to
the silence at the start of the ogg file.
Comment 8 Miloslav Trmac 2003-07-27 17:23:07 EDT
Bug in redhat-credits actually, causing ogg123 to dump its real-time console
output to /dev/dsp.

*** This bug has been marked as a duplicate of 100918 ***
Comment 9 Red Hat Bugzilla 2006-02-21 13:50:57 EST
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.

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