[pulseaudio-tickets] [Bug 92318] New: Speakers pop when when PA starts (v 6.0-7.0)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92318

            Bug ID: 92318
           Summary: Speakers pop when when PA starts (v 6.0-7.0)
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: core
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: tobias.lr.dahlberg at telia.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

I run Arch Linux and I've had this issue with both PA 6.0 and 7.0. I also have
Ubuntu on the same system which runs PA 4.0 (which doesn't produce this pop).

When ever pulseaudio starts (during desktop [GDM] startup), I get a LOUD pop
(electrical discharge) from my laptop speakers. I've installed fwm which
doesn't depend on PA and I notice no pops what so ever until I run pulseaudio
--start. The pop can be reproduced every time I ran pulseaudio --start (I have
to kill it and wait for a few seconds first). I've removed ALSA's Pulse
references in /etc/asound.conf and I can use aplay to play audio without
getting any pops but if I use GDM (which depends on PA) then I get a pop every
time PA is restarted after a soundcard powersave mode (started by PA client,
waking sound chip up using ALSA playback doesn't cause a pop). PA doesn't crash
or produce any errors that I've been able to spot, the sound plays just fine.
I've zeroed this down to PA because I can still use aplay without causing any
pops inside Gnome. I've looked around for various hints and tricks to get the
popping to stop happening but none of them work, which includes adding tsched=0
to the udev-detect module. I've tried everyting, including copying the configs
in /etc/pulse/ from Ubuntu to my Arch installation and it doens't change the
result nor does it introduce new problems. I've turned off flat-volumes and
autospawn as well, which doesn't affect my issue at all. PA works flawlessly
except for these really annoying pops. I've now resorted to blacklisting the
audio until I get this fixed. The pop on startup is really loud and it doesn't
sound healthy for the speakers at all. I can modprobe snd_hda_intel in fwm
xterm and use aplay without pops but it pops when I start PA.

I've tried to find assistance in #pulseaudio, #archlinunx and ##linux on
Freenode but no one knows what to do. I've also posted a thread here:
http://www.neowin.net/forum/topic/1274370-arch-loud-pop-on-startup/

My hardware is: Lenovo Thinkpad T450s.
Sound hardware: Intel HD Audio, Realtek ALC3232.
Linux kernel: 4.2.2

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