Bug 863197 - Sound card outputs some sound while the VOLUME is set at ZERO
Sound card outputs some sound while the VOLUME is set at ZERO
Product: Fedora
Classification: Fedora
Component: alsa-firmware (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Tim Jackson
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-10-04 12:14 EDT by Andrei ILIE
Modified: 2012-10-04 14:01 EDT (History)
2 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-10-04 14:01:59 EDT
Type: Bug
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Tracker ID Priority Status Summary Last Updated
KDE Software Compilation 306493 None None None 2012-10-04 12:14:51 EDT

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Description Andrei ILIE 2012-10-04 12:14:51 EDT
Setting volume @ zero doesn't work correctly, as the sound card still outputs some sound. On the other side, muting works ok...

SOLUTION - Upon setting volume @ zero, two things should happen:
  ~ the sound card should be silent;
  ~ the mute flag for the respective chanel should be set system-wide.

$ cat /proc/asound/cards 0
  [Intel ]: HDA-Intel - HDA Intel
  HDA Intel at 0xfe8f4000 irq 45

$ yum list installed *phonon* *alsa*
  alsa-firmware.noarch 1.0.25-1.fc17
  alsa-lib.x86_64 1.0.26-1.fc17
  alsa-lib-debuginfo.x86_64 1.0.26-1.fc17
  alsa-utils.x86_64 1.0.26-1.fc17
  phonon.x86_64 4.6.0-3.fc17
  phonon-backend-gstreamer.x86_64 2:4.6.2-1.fc17
  phonon-backend-vlc.x86_64 0.6.0-1.fc17
Comment 1 Jaroslav Kysela 2012-10-04 14:01:59 EDT
Mute & volume are two different things. Some hardware does not mute the signal path when the volume register is set to the minimum. Usually, the HDA hardware can have -48dB .. 0dB signal ranges. ALSA copies this.

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