Refer to the log

PA can open mono playback and mono capture using hw:0

D: alsa-mixer.c: Profile output:analog-mono+input:analog-mono supported.

PA can also open front:0 stereo playback

D: alsa-mixer.c: Profile output:analog-stereo supported.

But PA fail for open front:0 for stereo capture because of the lock of
ctl elem 'EMUU10K1 PCM Send Routing' and 'EMU10K1 PCM Send Volume'  and
those locks had already been locked by the front playback device when PA
open front device

Those two controls mentioned in http://git.alsa-project.org/?p=alsa-
kernel.git;a=blob_plain;f=Documentation/sound/alsa/SB-Live-mixer.txt
associated with front device in http://git.alsa-project.org/?p=alsa-
lib.git;a=blob_plain;f=src/conf/cards/EMU10K1.conf

I: (alsa-lib)setup.c: Cannot lock ctl elem

PA should not open front , surround40 for capture

I: alsa-sink.c: Device doesn't support mmap(), falling back to UNIX read/write 
mode.
I: alsa-sink.c: Cannot enable timer-based scheduling, falling back to sound IRQ 
scheduling.


I: client.c: Created 0 "ConsoleKit Session /org/freedesktop/ConsoleKit/Session3"
D: module-console-kit.c: Added new session /org/freedesktop/ConsoleKit/Session3


D: main.c: Got org.pulseaudio.Server!
I: main.c: Daemon startup complete.


I: module-stream-restore.c: Restoring volume for sink input 
sink-input-by-application-name:Banshee.


D: memblockq.c: memblockq requested: maxlength=33554432, tlength=0, base=12, 
prebuf=0, minreq=1 maxrewind=0
D: memblockq.c: memblockq sanitized: maxlength=33554436, tlength=33554436, 
base=12, prebuf=0, minreq=12 maxrewind=0
I: sink-input.c: Created input 0 "Playback Stream" on 
alsa_output.pci-0000_01_0a.0.analog-surround-51 with sample spec s16le 2ch 
32000Hz and channel map front-left,front-right
I: sink-input.c:     media.name = "Playback Stream"
I: sink-input.c:     application.name = "Banshee"


I: alsa-sink.c: Using 8.0 fragments of size 5292 bytes (10.00ms), buffer size 
is 42336 bytes (80.00ms)

10 ms is smaller than PA 's 20ms watermark (i.e. PA have to wake up when
there is 2 fragments left in the buffer )

SNDRV_PCM_IOCTL_START failed when PA start surround51  playback

I: alsa-sink.c: Starting playback.
I: (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_START failed


E: alsa-sink.c: ALSA woke us up to write new data to the device, but there was 
actually nothing to write!
E: alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_emu10k1'. 
Please report this issue to the ALSA developers.

-- 
SB Audigy: Bad audio quality when told to use all 5.1 channels on emu10k1 cards
https://bugs.launchpad.net/bugs/455779
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