[Bug 1004593] [NEW] LFE disappears on 5.1, 4.0 has LFE channel, high pitched squeals (bit shifting?), several versions

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I've been trying to get support for this - some of the issues have been
around since at least 11.04 but I believe also under v10.

Since it's happened across several re-installs, I don't think that's my
issue - it seems to be "built in". I've asked, over the years, on
several support forums, tried enough stuff I don't think it's my using
the software wrong, so I think it's a bug. I'm happy to do any research
I need to to help solve the problem: let me know what information to
gather to best help! The issue used to be livable (no LFE/Bass channel
if I forget to turn it back on every once in a while. Now with the high
pitched squealing (I used to see this on another machine only when
running wine and it was having ALSA issues under 9.xx) makes the system
unusable even for listening to mp3's.

Here's my text from before, sorry if it's written more like a help
request than a bug report, but all the information is there.

----------------------------
I've given a quick look at the guides in this thread, if you think I need to run through them to give you more info, say the word and I'll run them... But perhaps something will sound familiar enough to you.

My system started as 10.04 and has followed the routine upgrades to
12.04. The system was built for this, a intel i3 with a Zotac H67ITX-C-E
(H67 chipset). I've done several fresh installs, and always have the
same issue:

After some indeterminate amount of time/interaction/sounds, I'll find
the LFE (the .1 from my 5.1) channel no longer playing. Going into the
sound controls and selecting most anything (even a non- bass channel
system like 4.0) will instantly find the sub-woofer working again. As
you can imagine, the ultimate home theater isn't that great when I have
to get up and tweak the settings twice a night.

Anyway, now on the fresh 12.04 install, I'm also getting very high
frequency noise, like when WINE used to have ALSA issues on my other
desktop. I could believe it to be bit shifting on the outputs - least
significant bits making a high frequency output on the highest volumes -
but it could be something else entirely.

This kinda sneaks in, and sometimes muting and unmuting fixes it. If
not, even running alsamixer won't fix it. Interestingly, switching to
4.0 (which gives me 4.1 sound) does fix it, going back to 5.1 restores
everything.

Does anyone have any suggestions? This issue has been going on for
years, but as it was only dropping base, I didn't care. Now that it's
endangering my speakers and my relationships, I need to do something. It
seems to happen after a couple hours of listening to music.

--> If this has been covered and I missed it, please point me to where I
can read up on it. Thank you.

THANKS!!!
-Abe.
__________
System Summary:
Ubuntu 12.04LTS 64 (clean install, issues present before)
Intel i3 2600t
Zotac H67ITX-C-E (H67 chipset, 2nd motherboard, same symptoms)
5.1 sound hooked up through analog outs

The closest I could find was
http://www.thinkwiki.org/wiki/Proble...audio_clipping about Z68 boards,
but it's not really clipping per se.

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: Opinion


** Tags: bot-comment
-- 
LFE disappears on 5.1, 4.0 has LFE channel, high pitched squeals (bit shifting?), several versions
https://bugs.launchpad.net/bugs/1004593
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