Red Hat Bugzilla – Bug 244535
Problems with sound input/output on emu10k after upgrade from FC6 to FC7
Last modified: 2007-11-30 17:12:07 EST
Description of problem:
After upgrade from FC6 to FC7 I have following problems with emu10k (Sound
Blaster Live! 5.1):
1. no sound output from Center speaker
2. sound now comes out of different connector
3. cannot record sound
Version-Release number of selected component (if applicable):
[techie@erazim ~]$ rpm -q kernel alsa-lib alsa-utils
[techie@erazim ~]$ uname -a
Linux erazim.local.lab.devnull.cz 2.6.21-1.3228.fc7 #1 SMP Tue Jun 12 15:37:31
EDT 2007 i686 athlon i386 GNU/Linux
play or record sounds
Sound output lacks central speaker and sound recording does not work.
Sound output and input should work as it worked in FC6.
On my SoundBlaster Live! sound card there are following jacks/connectors: (from
left to right)
In FC6 I have used black+orange to get sound output. black was all 5 speakers,
orange was central speaker. All worked flawlessly. After upgrade to FC7 the
sound no longer comes from the black output but from the green output. Also, no
sound (or very very weak and with noise) comes out from the orange speaker.
I have booted Ubuntu LiveCD to see if this is really software problem and yes,
it is behaving in the same way as FC7.
The recording problem is this: I am able to hear myself in the speakers when I
speak into the microphone. Also, when I set microphone boost (+20dB) I begin to
hear back-coupling in the speakers. So, microphone works correctly as does the
input port on the sound card but somehow (the driver ?) it does not get the
sound any further. I am pretty sure I have seen bugs like that in ALSA before.
I have also tried to regenerate config files in system-config-soundcard and
reboot afterwards but it did not fix the problem.
Created attachment 157204 [details]
scsconfig.log generated via system-config-soundcard
I have bumped 'Wave Center' in alsamixer to value 82 and I can hear the Center
again. I have played with other settings in alsamixer as well and now the black
socket offers sound output as well.
Seems like alsamixer settings got garbled during upgrade. (or the format
I have got the recording back as well, although I am not sure what was required
to get it working. (probably 'Wave capture') Clearly something has changed
between FC6 and FC7 so this should be at least reclassified as some sort of
I'm reviewing this bug as part of the kernel bug triage project, an attempt to
isolate current bugs in the fedora kernel.
This bug appears to be resolved and I am therefore closing it. If I have erred,
please forgive me and re-open with any additional information you are able to
give. I will then try and assist you if I can.