| Summary: | Sound garbled due to underruns with certain sound cards | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Dmitry Torokhov <dmitry.torokhov> |
| Component: | alsa-plugins | Assignee: | Jaroslav Kysela <jkysela> |
| Status: | CLOSED ERRATA | QA Contact: | Desktop QE <desktop-qa-list> |
| Severity: | medium | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 6.1 | CC: | jkoten, jshortt, tpelka |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-05-11 00:41:27 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Bug Depends On: | |||
| Bug Blocks: | 1269638, 1270066 | ||
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. If you would like it considered as an exception in the current release, please ask your support representative. This request was not resolved in time for the current release. Red Hat invites you to ask your support representative to propose this request, if still desired, for consideration in the next release of Red Hat Enterprise Linux. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-0924.html |
Description of problem: Certain sound cards when configured in surround sound mode produce garbled sound when used with PulseAudio and ALSA PulseAudio plugin. Version-Release number of selected component (if applicable): alsa-plugins-pulseaudio 1.0.21 How reproducible: Always Steps to Reproduce: 1. Use card driven by snd-ca0106 driver 2. Configure sound card to work in 4.0, 5.1 or 7.1 mode 3. "aplay -B 100000 <Sound.wav>" Actual results: Sound is mangled beyond recognition; both aplay and pulseaudio report high number of underruns. Expected results: Song played properly. Additional info: Updating to alsa-plugins-pulseaudio 1.0.24 or simply back-porting following commit fixes the problem: commit c20d516e229620129ee20175d8fee8511cc3a4bd Author: Takashi Iwai <tiwai> Date: Fri Jul 9 14:05:03 2010 +0200 pulse: Add handle_underrun option Added a config option "handle_underrun" to specify whether pulse plugin handles the underrun reported from PA. The default value is now set to false, i.e. it will ignore underruns in PA (for good reasons below). You can take back to the old behavior by setting handle_underrun true. The original idea was brought by David Henningsson <diwic>, while this patch is simplified and makes the behavior configurable. The reasons for avoiding underruns (cited from David's original patch): Reporting underruns to ALSA seems to do more bad than good, for these reasons: * If pulseaudio gets an underrun, the normal way to end that underrun is to feed it with more buffers. This is different from the ALSA way of dealing with underruns, which requires hardware buffer pointers to be reset. * In addition, underrun signals are delivered asynchronously from pulseaudio. This means that there might be more buffers on the way to pulseaudio when the underrun is reported, making the underrun obsolete. Unfortunately, there is currently no known way to determine whether this is the case or not. Signed-off-by: Takashi Iwai <tiwai>