[pulseaudio-tickets] [Bug 47899] Stuttering when using "Simultaneous output"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47899

--- Comment #42 from Raymond <superquad.vortex2 at gmail.com> ---
3.6.1 DMA Position in Current Buffer

The “DMA Position in Buffer” structure is written to a memory buffer each time
a stream DMA position changes.

3.6.2 Buffer Descriptor List

The Buffer Descriptor List (BDL) is a memory structure that describes the
buffers in memory. The BDL is comprised of a series of Buffer Descriptor List
Entries. There must be at least two entries in the list, with a maximum of 256
entries

3.6.3 Buffer Descriptor List Entry

Each Buffer Descriptor List Entry (BDLE) contains a description of a buffer
which is a piece of the whole cyclic stream buffer.

The buffers described by the BDLE must start on a 128-byte boundary, and the
length must be an integer number of Words.


your two hda controllers will use same buffer size(buffer time 1 seconds) at
stereo 48000Hz since  

One second * 48000Hz * 4 bytes align at 128 byte boundary but 44100Hz does not
align at 128bytes

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