Red Hat Bugzilla – Bug 856838
ALSA HDA driver and HP onboard sound is causing crackling/popping during volume change in RHEL5
Last modified: 2014-01-29 04:06:11 EST
+++ This bug was initially created as a clone of Bug #856837 +++
Description of problem:
I did also some measurement and the ALSA HDA driver tests to eliminate the pops caused by the volume changes (volume slider changes) using a mixer application.
I believe that this issue is related directly to hardware and hardware vendor should be asked, why changing of the volume in the HDA audio codec causes pops in the analog output. I can reproduce the clicks with some hardware, but other hardware does not suffer from this issue. I verified the driver and I do not see any problems there. Also, I wrote a script changing the volume periodically using direct HDA codec writes and the pops are there (for some HDA codec types), too.
Perhaps, there might be a vendor specific workaround to set the volume without clicks outside the HDA specification from Intel, but also in this case, the hardware vendor (HDA codec vendor, PC vendor) might be asked to provide this information.
Version-Release number of selected component (if applicable):
Easily on HP onboard sound.
Steps to Reproduce:
1. Move volume slider up and donw to change audio volume.
Volume change with crackling/popping.
Volume change with no crackling/popping.
Still narrowing down other affected hardware
This request was not resolved in time for the current release.
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the next release of Red Hat Enterprise Linux.
I'm sorry, but I don't see any way to fix the hardware issue.