Bug 999235

Description of problem:
=======================
After playing any kind of sound on an Asus M5A78L-M/USB3, pulseaudio does not completely switch off the sound.
It keeps playing a continuous stereo tone that is apparently related to the last few samples played, since the pitch changes dependig on the last sound played. The volume of the tone is low, but audible.
The problem happens both in Fedora 18 and Fedora 19 both with 32 and 64 bit os. 

The audio hardware on the asus M5A78L-M is:
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA)
01:05.1 Audio device: Advanced Micro Devices [AMD] nee ATI RS780 HDMI Audio [Radeon HD 3000-3300 Series]

The problem does not present itsef on other audio hardware, namely I tried the very same OS on an Acer Aspire 5100, on an intel Desktop Board with builtin audio and on the same M5A78L-M with an addon card with no probelms, so it is probably limited to the specific sound chip present on this motherboard.

If pulseaudio is restarted, the tone stops as soon as puleaudio completes its initialization process. 



Version-Release number of selected component (if applicable):
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pulseaudio-2.1-6.fc18 pulseaudio-2.1-6.fc19
Tested with 3.9.10/11 and 3.10.4/6/7 kernel

How reproducible:
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Always

Steps to Reproduce:
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1. Play audio
2. Stop audio

Actual results:
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Continuous beeeeeeeep :/ 

Expected results:
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Silence

Additional info:
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The configuration tested is quite simple. No fancy stuff: the ATI RS780 HDMI Audio is disabled and a pair of normal stereo speakers are attached to the audio output on the mainboard.