Red Hat Bugzilla – Bug 380991
Left channel audio distortion with kernels >= 18.104.22.168-49.fc8
Last modified: 2014-09-02 12:19:56 EDT
Description of problem:
Using kernel-22.214.171.124-49.fc8 on a second gen macbook pro, there is
a constant static/popping in the left channel audio. Some programs (such as
skype) only output audio on the left channel, whereas others (like amarok) can
output stereo but with the aforementioned distortion.
I also have duplicated mixer controls for Capture, Mux, and Input Source that
were not present on first boot. Disabling their display does not stick.
External speakers are still solely controlled by the Surround control.
Version-Release number of selected component (if applicable):
Kernel 126.96.36.199-49 on Fedora 8.
Seems to be always but I'll update if I manage to get it to boot with clean sound.
Steps to Reproduce:
2. Play sound.
Distortion in left audio channel.
I have a Fedora 7 bug filed for the same problem. See bug 368901.
Created attachment 257431 [details]
I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug and will try and assist you in resolving it if I can.
There hasn't been much activity on this bug for a while. Could you tell me if
you are still having problems with the latest kernel?
If the problem no longer exists then please close this bug or I'll do so in a
few days if there is no additional information lodged.
*** Bug 368901 has been marked as a duplicate of this bug. ***
The last time this happened (it's been awhile now) I was able to fix the problem
by powering off the machine, removing the battery, waiting (10 seconds),
replacing the battery, and powering the machine back up. I'm not sure if this
is software related or not.
This used to happen on every power up and now it's been at least a month since
the last occurrence.
Thanks for the update - I'll close this for the moment as INSUFFICIENT_DATA but
please re-open if it re-occurs. Thanks for taking the time to file the original
It just happened again. I'm beginning to think that it's only when I boot into
windows and then reboot to linux that the problem has a chance of happening.
I'm not sure if the windows driver is putting the card into a state that's not
being reset properly by the linux driver.
Okay, when the problem re-occurs again for you can you post the output of the
following commands as separate text/plain attachments.
# lspci -vvxxx > lspci.out
dmesg > dmesg.out
Can you also confirm you are using the latest kernel and I'll update the bug
summary to reflect that. You may wish to test with a 2.6.24-based kernel as well
as and when you are able.
I'm currently running 188.8.131.52-85.fc8. I'll post the requested files the next
time it happens. I'll work on booting a 2.6.24 kernel as well.
Okay, thanks Ryan. Setting back to NEEDINFO to indicate we're waiting on some
more tests from you.
I just installed kernel 184.108.40.206-107.fc8 via yum, rebooted (twice), and then
noticed that my left channel audio is distorted. Attaching requested files.
Created attachment 293020 [details]
Created attachment 293021 [details]
Comment on attachment 293021 [details]
Bad MIME type.
Could you try booting up using the radeon graphics driver (as opposed to fglrx)
and with vmware stuff disabled and see if this makes a difference. Also of
Let me know how you get on.
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I periodically still get reminders to test this bug. Responding to clear the queue.