[pulseaudio-tickets] [Bug 93651] New: pulseaudio try to open non-existent /dev/snd/pcm* which hugely increased startup time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93651

            Bug ID: 93651
           Summary: pulseaudio try to open non-existent /dev/snd/pcm*
                    which hugely increased startup time
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: alsa
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: tom.ty89 at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

So I have the following cards:
[tom at localhost ~]$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: STX [Xonar STX], device 0: Multichannel [Multichannel]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: STX [Xonar STX], device 1: Digital [Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

And this is how /dev/snd/ looks like:
[tom at localhost ~]$ ls -l /dev/snd/
total 0
drwxr-xr-x  2 root root       80 Jan 10 21:39 by-path
crw-rw----+ 1 root audio 116,  7 Jan 10 21:39 controlC0
crw-rw----+ 1 root audio 116,  2 Jan 10 21:39 controlC1
crw-rw----+ 1 root audio 116,  6 Jan 10 21:39 hwC1D0
crw-rw----+ 1 root audio 116,  9 Jan 10 21:39 pcmC0D0c
crw-rw----+ 1 root audio 116,  8 Jan 10 21:39 pcmC0D0p
crw-rw----+ 1 root audio 116, 11 Jan 10 21:39 pcmC0D1c
crw-rw----+ 1 root audio 116, 10 Jan 10 21:39 pcmC0D1p
crw-rw----+ 1 root audio 116,  3 Jan 10 21:39 pcmC1D3p
crw-rw----+ 1 root audio 116,  4 Jan 10 21:40 pcmC1D7p
crw-rw----+ 1 root audio 116,  5 Jan 10 21:39 pcmC1D8p
crw-rw----+ 1 root audio 116,  1 Jan 10 21:39 seq
crw-rw----+ 1 root audio 116, 33 Jan 10 21:39 timer

And you can see that the pulseaudio takes much longer (5 seconds!) to start
before I blacklist snd-hda-intel (so that card 1 is gone):

Jan 10 21:31:33 localhost systemd[257]: Starting Sound Service...
Jan 10 21:31:33 localhost systemd[257]: Started D-Bus User Message Bus.
Jan 10 21:31:39 localhost systemd[257]: Started Sound Service.
Jan 10 21:31:39 localhost systemd[257]: Reached target Default.
Jan 10 21:31:39 localhost systemd[257]: Startup finished in 5.830s.

Jan 10 21:32:16 localhost systemd[248]: Starting Sound Service...
Jan 10 21:32:17 localhost systemd[248]: Started D-Bus User Message Bus.
Jan 10 21:32:17 localhost systemd[248]: Started Sound Service.
Jan 10 21:32:17 localhost systemd[248]: Reached target Default.
Jan 10 21:32:17 localhost systemd[248]: Startup finished in 306ms.

(https://gist.github.com/tomty89/76e9ce98ba85121fc12d/revisions?diff=split)

And the reason seems to be somehow pulse tries to open
/dev/snd/pcmC1D{0,1,9-13}p (well also /dev/snd/pcmC1D0c) which does not exist.
Please see my attached logs for details.

P.S. I do NOT file this bug report because it is blocking the login shell from
popping up after I entered my password in the tty, though I think that could be
an issue (of systemd?) too. I file this here merely because I think pulseaudio
is doing something silly for HDMI/DP sound devices. As you can see it's being
random (9-13, but not >=14, 4-6 or 2, or the existing 3, 7 and 8).

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