Red Hat Bugzilla – Bug 81209
(SCHEDULER ?)Sound distortion on VIA 686b
Last modified: 2013-07-02 22:09:53 EDT
Description of problem: This is one of the bug reports that are unlikely to get fixed, but anyhow: kernel-2.4.20-2.2 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
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.
Sorry, I forgot to say explicitly that in RHL 8.0 there is no such problem, and redhat-credits apparently hasn't changed.
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.
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.
Looks like an O(1) scheduler interaction example
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.
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.
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 ***
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.