Ubuntu
linux package

using "capture" volume>84 records only crackling noise or silenence

Bug #374438 reported by Martin Olsson
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Fix Released
Undecided
Unassigned

Bug Description

(I'm attaching alsa-info.sh and I'm willing to try patches and/or experiment with settings to get this fixed)

When I record sound in the gnome-sound-recorder the recorded audio comes out of loud horribly crackling noise or sometimes as plain silence, whenever I set "capture" volume to anything above 84 (I did a small binary search to find out that 84 is the magic volume that works whereas any volume higher than that does not work). I've test this very carefully and I'm absolutely sure that changing _only_ the capture volume (not changing any other setting) introduces the crackling noise and lowering the capture volume again makes it to away.

I've confirmed this in detail with gnome-system-recorder because I wanted to make sure the bug was still there with a very simple application (what really prompted me to start investing with was that skype didn't work, it suffers from the exact same problem).

In general this is an old machine which has been upgraded to jaunty recently.

Revision history for this message
Martin Olsson (mnemo) wrote :
Revision history for this message
Martin Olsson (mnemo) wrote :

What I do when I mess around with this stuff is that I launch "alsamixer" and then I press TAB to switch to the capture related mixer controllers and the finally I use arrow keys to adjust "capture" volume and I use CTRL-C to exit.

Daniel T Chen (crimsun)
affects: pulseaudio (Ubuntu) → linux (Ubuntu)
Revision history for this message
Jeremy Foshee (jeremyfoshee) wrote :

Hi Martin,

This bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? Can you try with the latest development release of Ubuntu? ISO CD images are available from http://cdimage.ubuntu.com/releases/lucid.

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 374438

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

[This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

tags: added: kernel-sound
tags: added: needs-kernel-logs
tags: added: needs-upstream-testing
tags: added: kj-triage
Changed in linux (Ubuntu):
status: New → Incomplete
Revision history for this message
Martin Olsson (mnemo) wrote :

I just tried to raise the capture volume above 84 now and it works well. I guess it's the upgrade to karmic that fixed it.

Changed in linux (Ubuntu):
status: Incomplete → Fix Released
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