[Bug 494099] Re: subwoofer stops working after playback ends

[Daniel T Chen]

> What "control"? This bug doesn't mention any controls.
> The bug is - subwoofer stops working every time
> playback ends. No controls at all.

LFE (the subwoofer mixer control to which I'm referring) is wired
incorrectly on many machines. On some machines, LFE is not correctly
implemented with filtering. So, PulseAudio cannot assume that LFE works
correctly on every machine. It is not surprising that the configuration
option of enabling LFE remixing works on some machines and completely
breaks on others.

> No, I'm not understand. Without PulseAudio with pure ALSA
> everything works just great, subwoofer works everytime,
> with no need to reset any settings in ALSA.

If the volume is being changed after a stream ends, that isn't
necessarily a PulseAudio issue. In fact, most of the time it's an
application issue or a mixer applet issue. However, you haven't provided
enough details to really debug this symptom. Start by providing a
verbose PA log.

> What exactly wrong in hardware or driver in your opinion?

I've just explained above how the hardware is sometimes at fault and how
sometimes the bugs need to be worked around (or the hardware plain
disabled) in linux.

> Why with ALSA everything works great?

You don't necessarily see the symptom, but that certainly doesn't imply
that ALSA is bug-free in this context, either.

>> Please open a linux task, and reset the pulse task to wontfix.
> "Won't open"

Fine. Done.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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subwoofer stops working after playback ends
https://bugs.launchpad.net/bugs/494099
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