BugReport: Dice works partially [Broken]

BugReport: Dice works partially [Broken]

[Stanislav Sergiienko]

Hi, I am a user of TC Electronic DesktopKonnekt6 and latest kernel
update 3.19.2 add partial support for my device and thus broke my
usual sound workflow. So i want to make good bug report to make device
usable on latest kernels.

With 3.19.2 kernel device is successfully recognized by system and
even sometimes can play sound(!). But always, after some time sound is
breaks (usually after 30-90 seconds) and to restore it i must restart
pulseaudio(v6.0) and application. So device becomes unusable on
latests kernels.
Earlier i use my sound card through ffado + jackdbus + pulseaudio. Now
it's impossible, so i have to downgrade kernel.

Please request any additional info that you need to fix problem and i
will post it here soon. Also i can test any "bleeding edge" changes
thru dkms as described here:
https://github.com/takaswie/snd-firewire-improve

Related bug(not mine):
https://bugs.archlinux.org/task/44258

Some useful info:

cat /proc/asound/cards
 0 [DesktopKonnekt6]: DICE - DesktopKonnekt6
                      TC Electronic DesktopKonnekt6 (serial 12941) at
fw1.0, S400

cat /proc/asound/card0/dice
sections:
  global: offset 10, size 90
  tx: offset 100, size 142
  rx: offset 242, size 282
  ext_sync: offset 524, size 4
  unused2: offset 0, size 0
global:
  owner: ffc1:000100000000
  notification: 00000040
  nick name: DesktopKonnekt6
  clock select: internal 44100
  enable: 1
  status: locked 44100
  ext status: 00000000
  sample rate: 44100
  version: 1.0.4.0
  clock caps: 44100 48000 88200 96000 176400 192000 arx1 arx2 internal
  clock source names:
Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\INTERNAL\\
tx 0:
  iso channel: 0
  audio channels: 6
  midi ports: 0
  speed: S400
  names: ch 1\ch 2\ - \ - \ - \ - \\
  ac3 caps: 00000000
  ac3 enable: 00000000
rx 0:
  iso channel: 1
  sequence start: 0
  audio channels: 6
  midi ports: 0
  names: main out 1\main out 2\phones out 1\phones out 2\ - \ - \\
  ac3 caps: 00000000
  ac3 enable: 00000000
ext status:
  clock source: internal
  locked: 1
  rate: 44100
  adat user data: 0

Re: BugReport: Dice works partially [Broken]

[Clemens Ladisch]

Stanislav Sergiienko wrote:
> Hi, I am a user of TC Electronic DesktopKonnekt6 and latest kernel
> update 3.19.2 add partial support for my device and thus broke my
> usual sound workflow. So i want to make good bug report to make device
> usable on latest kernels.
>
> With 3.19.2 kernel device is successfully recognized by system and
> even sometimes can play sound(!).

What exactly happens when it cannot play sound?

> But always, after some time sound is breaks (usually after 30-90
> seconds) and to restore it i must restart pulseaudio(v6.0) and
> application.

What exactly happens when it "breaks"?
Any error messages in the system log?


Regards,
Clemens

Re: BugReport: Dice works partially [Broken]

[Stanislav Sergiienko]

> Any error messages in the system log?

The problem is that i couldn't find any significant errors. All i was
able to gather is:

journalctl:
апр 13 13:47:56 ArchLinux pulseaudio[2115]: [pulseaudio] pid.c: Daemon
already running.
апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
alsa-sink.c: ALSA woke us up to write new data to the device, but
there was actually nothing to write!
апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_dice'.
Please report this issue to the ALSA developers.
апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent
snd_pcm_avail() returned 0 or another value < min_avail.

Sometimes see this:
май 03 17:30:27 ArchLinux pulseaudio[657]: [alsa-sink-DICE]
alsa-sink.c: Resume failed, couldn't restore original sample settings.

Sometimes after play failed i see in sysnotification area:
"DesktopKonnect6 don't work, 'Default' will be used"

In dmesg i see no errors.

> What exactly happens when it cannot play sound?

No errors. It's just don't play anything. For example, for video,
various players handle it differently - some are just play video
without any sound, some can't play video at all(stops play on first
frame).

> What exactly happens when it "breaks"?

Almost nothing, sometimes i can hear that music breaks with some kind
of "click-sound", like someone pulled the wire from my loudspeakers.
But this sound is barely noticeable.
If i try to play file again i hear some kind of "initialization
sound", like when device open on PC boot.
It's hard to describe it in my English :)

If you send me info about how to gather more detailed logs, i try do this.
P.S. Sorry for long time to answer.
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Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: BugReport: Dice works partially [Broken]

[Takashi Sakamoto]

Hi,

To reveal what causes this issue, please post following test and the 
outputs. The test consists of 8 steps.

0. Plug-out your DesktopKonnect6.

1. To prevent snd_dice from auto-loading, add an entry to configuration 
file. See:
https://wiki.archlinux.org/index.php/Kernel_modules#Blacklisting

Perhaps:
$ cat /etc/modprobe.d/blacklist.conf
...
blacklist snd_dice
...

2. Reboot your system and confirm that snd_dice is not auto-loaded.

$ lsmod | grep snd_dice
(nothing)

3. Plug-in your DesktopKonnect6.

4. Wait one minute without do things
(I expect several bus reset occurs in IEEE 1394 bus then the bus becomes 
calm.)

5. Load snd_dice and check it
$ modprobe snd_dice
$ lsmod | grep snd_dice
snd_dice (you may see.)

6. Dump module information
$ cat /proc/asound/DesktopKonnekt6/dice
...(outputs)...

7. Try your playback test.

8. get logs from pulseaudio via journalctl or the other tools.


Regards

Takashi Sakamoto

On May 11 2015 07:10, Stanislav Sergiienko wrote:
>> Any error messages in the system log?
>
> The problem is that i couldn't find any significant errors. All i was
> able to gather is:
>
> journalctl:
> апр 13 13:47:56 ArchLinux pulseaudio[2115]: [pulseaudio] pid.c: Daemon
> already running.
> апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
> alsa-sink.c: ALSA woke us up to write new data to the device, but
> there was actually nothing to write!
> апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
> alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_dice'.
> Please report this issue to the ALSA developers.
> апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
> alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent
> snd_pcm_avail() returned 0 or another value < min_avail.
>
> Sometimes see this:
> май 03 17:30:27 ArchLinux pulseaudio[657]: [alsa-sink-DICE]
> alsa-sink.c: Resume failed, couldn't restore original sample settings.
>
> Sometimes after play failed i see in sysnotification area:
> "DesktopKonnect6 don't work, 'Default' will be used"
>
> In dmesg i see no errors.
>
>> What exactly happens when it cannot play sound?
>
> No errors. It's just don't play anything. For example, for video,
> various players handle it differently - some are just play video
> without any sound, some can't play video at all(stops play on first
> frame).
>
>> What exactly happens when it "breaks"?
>
> Almost nothing, sometimes i can hear that music breaks with some kind
> of "click-sound", like someone pulled the wire from my loudspeakers.
> But this sound is barely noticeable.
> If i try to play file again i hear some kind of "initialization
> sound", like when device open on PC boot.
> It's hard to describe it in my English :)
>
> If you send me info about how to gather more detailed logs, i try do this.
> P.S. Sorry for long time to answer.
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Re: BugReport: Dice works partially [Broken]

[Stanislav Sergiienko]

Hi, I did all you asked exactly step by step, and after that, even
more. Linux kernel == 4.1.4

This was printed by dmesg when I plugged card after reboot:
...
[   53.654603] cfg80211: Calling CRDA to update world regulatory domain
[   56.802735] cfg80211: Exceeded CRDA call max attempts. Not calling CRDA
[  163.474535] firewire_core 0000:0a:00.0: phy config: new root=ffc1,
gap_count=5
[  165.633183] firewire_core 0000:0a:00.0: created device fw1: GUID
000166040900328d, S400
[  165.635721] firewire_core 0000:0a:00.0: phy config: new root=ffc1,
gap_count=5
[  165.979725] firewire_core 0000:0a:00.0: giving up on node ffc0:
reading config rom failed: timeout
[  167.640492] firewire_core 0000:0a:00.0: BM lock failed (timeout),
making local node (ffc0) root
[  167.640496] firewire_core 0000:0a:00.0: phy config: new root=ffc0,
gap_count=5


This after modprobe (kde played notification sound on this command):
cat /proc/asound/DesktopKonnekt6/dice
sections:
  global: offset 10, size 90
  tx: offset 100, size 142
  rx: offset 242, size 282
  ext_sync: offset 524, size 4
  unused2: offset 0, size 0
global:
  owner: ffc1:000100000000
  notification: 00000040
  nick name: DesktopKonnekt6
  clock select: internal 48000
  enable: 0
  status: locked 48000
  ext status: 00000000
  sample rate: 48000
  version: 1.0.4.0
  clock caps: 44100 48000 88200 96000 176400 192000 arx1 arx2 internal
  clock source names:
Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\INTERNAL\\
tx 0:
  iso channel: -1
  audio channels: 6
  midi ports: 0
  speed: S400
  names: ch 1\ch 2\ - \ - \ - \ - \\
  ac3 caps: 00000000
  ac3 enable: 00000000
rx 0:
  iso channel: -1
  sequence start: 0
  audio channels: 6
  midi ports: 0
  names: main out 1\main out 2\phones out 1\phones out 2\ - \ - \\
  ac3 caps: 00000000
  ac3 enable: 00000000
ext status:
  clock source: internal
  locked: 1
  rate: 48000
  adat user data: 0



aplay -v ./test.wav
Playing WAVE './test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Plug PCM: Route conversion PCM (sformat=S16_LE)
 Transformation table:
   0 <- 0
   1 <- 1
   2 <- none
   3 <- none
   4 <- none
   5 <- none
Its setup is:
 stream       : PLAYBACK
 access       : RW_INTERLEAVED
 format       : S16_LE
 subformat    : STD
 channels     : 2
 rate         : 44100
 exact rate   : 44100 (44100/1)
 msbits       : 16
 buffer_size  : 8192
 period_size  : 1536
 period_time  : 34829
 tstamp_mode  : NONE
 tstamp_type  : MONOTONIC
 period_step  : 1
 avail_min    : 1536
 period_event : 0
 start_threshold  : 8192
 stop_threshold   : 8192
 silence_threshold: 0
 silence_size : 0
 boundary     : 4611686018427387904
Slave: Hardware PCM card 0 'DesktopKonnekt6' device 0 subdevice 0
Its setup is:
 stream       : PLAYBACK
 access       : MMAP_INTERLEAVED
 format       : S16_LE
 subformat    : STD
 channels     : 6
 rate         : 44100
 exact rate   : 44100 (44100/1)
 msbits       : 16
 buffer_size  : 8192
 period_size  : 1536
 period_time  : 34829
 tstamp_mode  : NONE
 tstamp_type  : MONOTONIC
 period_step  : 1
 avail_min    : 1536
 period_event : 0
 start_threshold  : 8192
 stop_threshold   : 8192
 silence_threshold: 0
 silence_size : 0
 boundary     : 4611686018427387904
 appl_ptr     : 0
 hw_ptr       : 0
^CAborted by signal Прерывание...
aplay: pcm_write:1939: write error: Прерван системный вызов


aplay freezes randomly and prints NO ERRORS. Same with pulseaudio, i
tried even pulseaudio -v --log-level=4 (huge output) but no errors
when playing stopped.
I have try to set various sample size format and clock rate, same results.

After that I even use python lib
https://github.com/larsimmisch/pyalsaaudio/ to debug tiny program that
plays .wav. I tried to see where exactly was error, and found that no
errors is occured, program always blocked here:
...
    while data:
        y = device.write(data)   # blocked here
        print('WRITTEN=', y)
        ...

That's why there is no errors in any programs.

Then I remember about strace:

strace -i -v -T -y -yy aplay ./test.wav
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=4,
revents=POLLOUT}]) <0.033380>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000056>
[00007f2b607aefad] read(3</home/stas/test.wav>,
"N\0\0\0024\0\31\2\306\0^\2\36\1~\2\301\0\350\1\330\0\331\1\277\0d\1$\1{\1"...,
6144) = 6144 <0.000067>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000058>
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=4,
revents=POLLOUT}]) <0.035439>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000030>
[00007f2b607aefad] read(3</home/stas/test.wav>,
"\267\373\225\372\225\373Q\372U\373\342\371,\373\273\371\276\372?\371\340\3729\371\23\372\230\370\326\372F\371"...,
6144) = 6144 <0.000051>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000066>
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=4,
revents=POLLOUT}]) <0.033301>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000079>
[00007f2b607aefad] read(3</home/stas/test.wav>,
"_\1\313\377_\2\230\0\36\6\212\4\270\7\234\6\360\6f\0061\6o\5\362\2q\2t\0\3\0"...,
6144) = 6144 <0.000107>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000080>
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=4,
revents=POLLOUT}]) <0.033154>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000093>
[00007f2b607aefad] read(3</home/stas/test.wav>,
"\354\1W\5-\1\266\4t\377\1\3Y\376\330\1E\376\267\1\222\376\350\1<\377u\2\251\377\364\2"...,
6144) = 6144 <0.000081>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000033>
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=4,
revents=POLLOUT}]) <0.035188>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000087>
[00007f2b607aefad] read(3</home/stas/test.wav>,
"\306\350\353\346>\351I\347>\351\25\347\325\350\370\346v\346\372\344\317\343\205\342(\343O\342V\343\220\342"...,
6144) = 6144 <0.000090>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000089>
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=4,
revents=POLLOUT}]) <0.034704>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000083>
[00007f2b607aefad] read(3</home/stas/test.wav>,
"E\27\330\26>\32\320\31a\32F\31e\31\372\27\336\30t\27x\31\254\27\352\31\372\27\17\32)\30"...,
6144) = 6144 <0.000085>
[00007f2b604dc797] ioctl(4</dev/snd/pcmC0D0p>, SNDRV_PCM_IOCTL_HWSYNC,
0x7f2b60a13cf0) = 0 <0.000049>
[00007f2b604db18d] poll([{fd=4</dev/snd/pcmC0D0p>,
events=POLLOUT|POLLERR|POLLNVAL}], 1, 4294967295                    #
sound stops play here and program blocks


Same aplay but through pulseaudio:

[00007f3f7fa56fad] read(3<pipe:[76277]>, 0x7ffda627a910, 10) = -1
EAGAIN (Resource temporarily unavailable)
[00007f3f7fa51f07] futex(0x1fd17d0, FUTEX_UNLOCK_PI_PRIVATE, 0) = 0
[00007f3f7fa56fad] read(8</home/stas/test.wav>,
"i\10\200\7D\4\317\0023\4w\2\346\5/\4\307\6\373\4\177\6\344\4l\4\371\2\241\375\227\374"...,
22048) = 22048
[00007f3f7f78318d] poll([{fd=3<pipe:[76277]>,
events=POLLIN|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=3,
revents=POLLIN}])
[00007f3f7fa56f4d] write(6<pipe:[76278]>, "W", 1) = 1
[00007f3f7fa56fad] read(3<pipe:[76277]>, "x", 10) = 1
[00007f3f7fa56fad] read(3<pipe:[76277]>, 0x7ffda627a910, 10) = -1
EAGAIN (Resource temporarily unavailable)
[00007f3f7fa51f07] futex(0x1fd17d0, FUTEX_UNLOCK_PI_PRIVATE, 0) = 0
[00007f3f7fa56fad] read(8</home/stas/test.wav>,
"g\350_\350\260\350y\350\273\350\215\350\350\350\221\350\365\350\22\350\357\350\375\347\353\350\330\350\v\351\307\351"...,
22048) = 22048
[00007f3f7f78318d] poll([{fd=3<pipe:[76277]>,
events=POLLIN|POLLERR|POLLNVAL}], 1, 4294967295) = 1 ([{fd=3,
revents=POLLIN}])
[00007f3f7fa56f4d] write(6<pipe:[76278]>, "W", 1) = 1
[00007f3f7fa56fad] read(3<pipe:[76277]>, "x", 10) = 1
[00007f3f7fa56fad] read(3<pipe:[76277]>, 0x7ffda627a910, 10) = -1
EAGAIN (Resource temporarily unavailable)
[00007f3f7fa51f07] futex(0x1fd17d0, FUTEX_UNLOCK_PI_PRIVATE, 0) = 0
[00007f3f7fa56fad] read(8</home/stas/test.wav>,
"\36\355\"\355Z\355_\355\212\355\232\355\277\355\345\355\33\356P\356\273\356\341\356\264\357\326\357\337\360\363\360"...,
22048) = 22048
[00007f3f7f78318d] poll([{fd=3<pipe:[76277]>,
events=POLLIN|POLLERR|POLLNVAL}], 1, 4294967295


After my tests with aplay:

cat /proc/asound/DesktopKonnekt6/dice
sections:
  global: offset 10, size 90
  tx: offset 100, size 142
  rx: offset 242, size 282
  ext_sync: offset 524, size 4
  unused2: offset 0, size 0
global:
  owner: ffc1:000100000000
  notification: 00000040
  nick name: DesktopKonnekt6
  clock select: internal 44100
  enable: 0
  status: locked 44100
  ext status: 00000000
  sample rate: 44100
  version: 1.0.4.0
  clock caps: 44100 48000 88200 96000 176400 192000 arx1 arx2 internal
  clock source names:
Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\Unused\INTERNAL\\
tx 0:
  iso channel: -1
  audio channels: 6
  midi ports: 0
  speed: S400
  names: ch 1\ch 2\ - \ - \ - \ - \\
  ac3 caps: 00000000
  ac3 enable: 00000000
rx 0:
  iso channel: -1
  sequence start: 0
  audio channels: 6
  midi ports: 0
  names: main out 1\main out 2\phones out 1\phones out 2\ - \ - \\
  ac3 caps: 00000000
  ac3 enable: 00000000
ext status:
  clock source: internal
  locked: 1
  rate: 44100
  adat user data: 0


I noticed that when sound is playing "ext status: 00000040". When
sound stops and program freezes then it sets to 00000000 again, even
if program still works (freezed).

Hope this helps to solve the problem.

2015-05-11 4:42 GMT+03:00 Takashi Sakamoto <o-takashi@sakamocchi.jp>:
> Hi,
>
> To reveal what causes this issue, please post following test and the
> outputs. The test consists of 8 steps.
>
> 0. Plug-out your DesktopKonnect6.
>
> 1. To prevent snd_dice from auto-loading, add an entry to configuration
> file. See:
> https://wiki.archlinux.org/index.php/Kernel_modules#Blacklisting
>
> Perhaps:
> $ cat /etc/modprobe.d/blacklist.conf
> ...
> blacklist snd_dice
> ...
>
> 2. Reboot your system and confirm that snd_dice is not auto-loaded.
>
> $ lsmod | grep snd_dice
> (nothing)
>
> 3. Plug-in your DesktopKonnect6.
>
> 4. Wait one minute without do things
> (I expect several bus reset occurs in IEEE 1394 bus then the bus becomes
> calm.)
>
> 5. Load snd_dice and check it
> $ modprobe snd_dice
> $ lsmod | grep snd_dice
> snd_dice (you may see.)
>
> 6. Dump module information
> $ cat /proc/asound/DesktopKonnekt6/dice
> ...(outputs)...
>
> 7. Try your playback test.
>
> 8. get logs from pulseaudio via journalctl or the other tools.
>
>
> Regards
>
> Takashi Sakamoto
>
>
> On May 11 2015 07:10, Stanislav Sergiienko wrote:
>>>
>>> Any error messages in the system log?
>>
>>
>> The problem is that i couldn't find any significant errors. All i was
>> able to gather is:
>>
>> journalctl:
>> апр 13 13:47:56 ArchLinux pulseaudio[2115]: [pulseaudio] pid.c: Daemon
>> already running.
>> апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
>> alsa-sink.c: ALSA woke us up to write new data to the device, but
>> there was actually nothing to write!
>> апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
>> alsa-sink.c: Most likely this is a bug in the ALSA driver 'snd_dice'.
>> Please report this issue to the ALSA developers.
>> апр 13 13:48:03 ArchLinux pulseaudio[2098]: [alsa-sink-DICE]
>> alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent
>> snd_pcm_avail() returned 0 or another value < min_avail.
>>
>> Sometimes see this:
>> май 03 17:30:27 ArchLinux pulseaudio[657]: [alsa-sink-DICE]
>> alsa-sink.c: Resume failed, couldn't restore original sample settings.
>>
>> Sometimes after play failed i see in sysnotification area:
>> "DesktopKonnect6 don't work, 'Default' will be used"
>>
>> In dmesg i see no errors.
>>
>>> What exactly happens when it cannot play sound?
>>
>>
>> No errors. It's just don't play anything. For example, for video,
>> various players handle it differently - some are just play video
>> without any sound, some can't play video at all(stops play on first
>> frame).
>>
>>> What exactly happens when it "breaks"?
>>
>>
>> Almost nothing, sometimes i can hear that music breaks with some kind
>> of "click-sound", like someone pulled the wire from my loudspeakers.
>> But this sound is barely noticeable.
>> If i try to play file again i hear some kind of "initialization
>> sound", like when device open on PC boot.
>> It's hard to describe it in my English :)
>>
>> If you send me info about how to gather more detailed logs, i try do this.
>> P.S. Sorry for long time to answer.
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