Red Hat Bugzilla – Bug 543612
Noise in headphones output coming from CD channel with default volumes
Last modified: 2010-12-03 21:21:11 EST
Created attachment 375519 [details]
Output of alsa-info.sh
Description of problem:
My sound card (HDA Intel on a Fujitsu-Siemens Amilo M1437G laptop) is not in alsa-lib's database. This means that default volumes have to be guessed at init time, and the volume for the "CD" channel is set to 54%.
As a result, when connecting a pair of headphones, noise coming from the CD channel can be heard, lowering sound quality.
Version-Release number of selected component (if applicable): 1.0.21-3.fc12
How reproducible: Always
Steps to Reproduce:
1. Run alsactl init (to reset default volumes for my card)
2. Listen to anything through the headphones
Bad sound quality due to noise coming from the CD channel.
Created attachment 375524 [details]
Output of "amixer -c0" before applying needed changes with alsamixer
Created attachment 375527 [details]
Output of "amixer -c0" after applying needed changes with alsamixer
Created attachment 375533 [details]
Patch to /lib/alsa/init/hda
Attaching the patch I applied to file /lib/alsa/init/hda to make changes permanent in my laptop. Basically I copied the info that existed already for "Acer Travelmate 8100", replaced my card's subsystem vendor and device, added a line to turn off the CD Playback switch, and removed Front Playback Volume and Switch, which do not exist for my card.
Not sure if completely turning off the CD Playback channel is a good idea for everyone, but it seems pretty safe as I can play audio CD's with Rhythmbox without any problems.
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