[pulseaudio-tickets] [Bug 104408] New: loopback on ladspa-sink: huge, persistent delay introduced by VT switch

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104408

            Bug ID: 104408
           Summary: loopback on ladspa-sink: huge, persistent delay
                    introduced by VT switch
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: dap78 at magex.hu
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

I use the following "chain" for VoIP audio processing:

# VoIP apps: higher tone
load-module module-ladspa-sink sink_name=spk-voip-eq-out plugin=mbeq_1197
label=mbeq
control=-30.0,-19.1,-18.6,-18.6,-18.6,-10.0,-8.0,-6.5,1.5,1.5,1.5,8.5,10.6,10.6,10.6
# VoIP apps: joint volume control
load-module module-null-sink sink_name=spk-voip-vol-out
sink_properties='device.description="Speaker VoIP Volume Out"'
load-module module-loopback source=spk-voip-vol-out.monitor
sink=spk-voip-eq-out latency_msec=4

The problem is a huge, persistent, 100% reproducible delay that appears on the
loopback after VT switch. The delay could be 5 seconds or even more, followable
on volume meters of pavucontrol. No problem if loopback's sink is other
loopback or hardware device instead of ladspa-sink OR user is a member of the
`audio` group thus access is not suspended on VT switch. Need to restart
pulseaudio to get rid of the introduced delay. Temporary moving of loopback's
sink to other loopback or hardware device eliminates the delay but it returns
after restore. Pulseaudio does not log anything that worth to mention.

I have nothing special in my PA config but I can share as is if necessary.
Fedora 27, pulseaudio-11.1-7.fc27.x86_64

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