Red Hat Bugzilla – Bug 426602
distorted (but otherwise working) sound from snd-hda-intel
Last modified: 2009-01-09 00:35:31 EST
Description of problem:
Although sound works perfectly otherwise, the output is distorted, like it went
through a distortion or overdrive filter. Connected external speakers, tested
on two HP laptops with Intel audio. EL5 (2.6.18) does not have the problem.
Version-Release number of selected component (if applicable):
Distortion is audible in Soundcard Detection, or in any audio application.
Steps to Reproduce:
1.Select Soundcard Detection from menu
2. Click Test button.
3. Install flash plugin and goto magnatune.com or youtube.com to hear distortion
on a wide variety of sounds, or play a CD.
Distortion, especially on low frequencies. This is some kind of clipping, not
just "tinny" tone.
Clear audio. ("Tinny" is to be expected on laptop speakers, but not distortion.)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller
Lots of people have this problem. Apparently works in F7 and Ubuntu as well as EL5.
Try turning down the volume inside the application program. Some of them
apparently feed overmodulated sound to ALSA...
It is mostly fixed by compiling and installing the latest alsa source per the
instructions in the forum thread. The few remaining cases (full chorus in
classical) could indeed be the applications. To recap:
su -c "yum groupinstall 'Development Tools'"
su -c "yum install mercurial"
hg clone http://hg-mirror.alsa-project.org/alsa-driver alsa-driver
hg clone http://hg-mirror.alsa-project.org/alsa-kernel alsa-driver/alsa-kernel
make ALSAKERNELDIR=alsa-kernel all-deps
make || make
su -c "make install"
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