Bug 45956 - Slider inaccurately controlling output
Summary: Slider inaccurately controlling output
Status: RESOLVED WORKSFORME
Alias: None
Product: PulseAudio
Classification: Unclassified
Component: misc (show other bugs)
Version: unspecified
Hardware: x86 (IA32) Linux (All)
: medium major
Assignee: pulseaudio-bugs
QA Contact: pulseaudio-bugs
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-02-12 10:10 UTC by Matthew
Modified: 2012-02-15 10:11 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments

Description Matthew 2012-02-12 10:10:19 UTC 
Using F16, the volume controller only controls volume at the last 20% of the slider (i.e. at 80%, complete silence; 100%, full volume).
Comment 1 Tanu Kaskinen 2012-02-13 09:20:23 UTC 
This is probably due to bad decibel information from the alsa kernel driver.

There's probably a line like this in /etc/pulse/default.pa:

    load-module module-udev-detect

If you add "ignore_dB=yes" so that the line becomes

    load-module module-udev-detect ignore_dB=yes

does the volume start to work better (after rebooting or restarting pulseaudio)?
Comment 2 Matthew 2012-02-13 12:17:03 UTC 
That appears to definitely have helped it. Now it's more like the last 66% are in control.
Comment 3 Tanu Kaskinen 2012-02-15 09:03:51 UTC 
See http://pulseaudio.org/wiki/BadDecibel
Comment 4 Matthew 2012-02-15 10:00:23 UTC 
Thanks for your help, Tanu.
Comment 5 Tanu Kaskinen 2012-02-15 10:08:50 UTC 
Out of interest, did you settle with the "ignore_dB" workaround, or did you file a bug somewhere as instructed on that wiki page? If it's the decibel information is wrong for you, it will be wrong for everybody with the same hardware.
Comment 6 Matthew 2012-02-15 10:11:41 UTC 
I settled with ignore_db. It works a lot better than it did before, and I'm fine with that.


Now I have to figure out why my volume up / down / play / pause / forward / backward / brightness buttons fail halfway through the session and Software Update continuously fails.

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