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Mám notebook Dell XPS 15 a k němu dock Dell Thunderbolt Dock WD19TB. Na notebooku je nainstalovaný aktualizovaný Debian Bullseye. Pro zvuk používám pulseaudio.

Donedávna vše jelo v pohodě. V současnosti integrovaná zvukovka hraje v pohodě, ta v docku pomalu. Tím "pomalu" myslím, že zvuk je hluboký a trhaný. Stopl jsem, jak dlouho trvá v přehrávači, než odpočet do konce skladby poskočí o sekundu a bylo to cca 7 sekund. Takže přehrávání je cca 7x pomalejší.

Při přepnutí z interní na externí zvukovku je výstup pulseaudio --verbose takovýto:

I: [pulseaudio] core.c: configured_default_sink: alsa_output.pci-0000_00_1f.3.analog-stereo -> alsa_output.usb-Generic_USB_Audio_200901010001-00.analog-stereo
I: [pulseaudio] core.c: default_sink: alsa_output.pci-0000_00_1f.3.analog-stereo -> alsa_output.usb-Generic_USB_Audio_200901010001-00.analog-stereo
I: [pulseaudio] source-output.c: Freeing output 11 "Peak detect"
I: [pulseaudio] sink-input.c: Trying to change sample spec
I: [pulseaudio] protocol-native.c: Requested tlength=500.00 ms, minreq=124.99 ms
I: [pulseaudio] speex.c: Choosing speex quality setting 1.
I: [pulseaudio] module-stream-restore.c: Storing volume/mute/device for stream sink-input-by-media-role:music.
I: [pulseaudio] source-output.c: Trying to change sample spec
I: [pulseaudio] remap.c: Using stereo to mono remapping
I: [pulseaudio] source-output.c: Created output 12 "Peak detect" on alsa_output.usb-Generic_USB_Audio_200901010001-00.analog-stereo.monitor with sample spec float32le 1ch 25Hz and channel map mono
I: [pulseaudio] source-output.c:     media.name = "Peak detect"
I: [pulseaudio] source-output.c:     application.name = "PulseAudio Volume Control"
I: [pulseaudio] source-output.c:     native-protocol.peer = "UNIX socket client"
I: [pulseaudio] source-output.c:     native-protocol.version = "33"
I: [pulseaudio] source-output.c:     application.id = "org.PulseAudio.pavucontrol"
I: [pulseaudio] source-output.c:     application.icon_name = "audio-card"
I: [pulseaudio] source-output.c:     application.version = "4.0"
I: [pulseaudio] source-output.c:     application.process.id = "31458"
I: [pulseaudio] source-output.c:     application.process.user = "jka"
I: [pulseaudio] source-output.c:     application.process.host = "dell"
I: [pulseaudio] source-output.c:     application.process.binary = "pavucontrol"
I: [pulseaudio] source-output.c:     application.language = "en_US.UTF-8"
I: [pulseaudio] source-output.c:     window.x11.display = ":0.0"
I: [pulseaudio] source-output.c:     application.process.machine_id = "a296c1aded9e44fb902ab04632a6a2b3"
I: [pulseaudio] source-output.c:     application.process.session_id = "2"
I: [pulseaudio] source-output.c:     module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
I: [pulseaudio] protocol-native.c: Final latency 80.00 ms = 40.00 ms + 40.00 ms

Při přepnutí zpátky na bezproblémovou zvukovku vypíše:

I: [pulseaudio] core.c: configured_default_sink: alsa_output.usb-Generic_USB_Audio_200901010001-00.analog-stereo -> alsa_output.pci-0000_00_1f.3.analog-stereo
I: [pulseaudio] core.c: default_sink: alsa_output.usb-Generic_USB_Audio_200901010001-00.analog-stereo -> alsa_output.pci-0000_00_1f.3.analog-stereo
I: [pulseaudio] source-output.c: Freeing output 12 "Peak detect"
I: [pulseaudio] sink-input.c: Trying to change sample spec
I: [pulseaudio] sink.c: Cannot update sample spec, monitor source is RUNNING
I: [pulseaudio] protocol-native.c: Requested tlength=500.00 ms, minreq=124.99 ms
I: [pulseaudio] resampler.c: Forcing resampler 'copy', because of fixed, identical sample rates.
I: [pulseaudio] module-stream-restore.c: Storing volume/mute/device for stream sink-input-by-media-role:music.
I: [pulseaudio] source-output.c: Trying to change sample spec
I: [pulseaudio] source.c: Cannot update sample spec, SOURCE_IS_RUNNING, will keep using s16le and 44100 Hz
I: [pulseaudio] remap.c: Using stereo to mono remapping
I: [pulseaudio] source-output.c: Created output 13 "Peak detect" on alsa_output.pci-0000_00_1f.3.analog-stereo.monitor with sample spec float32le 1ch 25Hz and channel map mono
I: [pulseaudio] source-output.c:     media.name = "Peak detect"
I: [pulseaudio] source-output.c:     application.name = "PulseAudio Volume Control"
I: [pulseaudio] source-output.c:     native-protocol.peer = "UNIX socket client"
I: [pulseaudio] source-output.c:     native-protocol.version = "33"
I: [pulseaudio] source-output.c:     application.id = "org.PulseAudio.pavucontrol"
I: [pulseaudio] source-output.c:     application.icon_name = "audio-card"
I: [pulseaudio] source-output.c:     application.version = "4.0"
I: [pulseaudio] source-output.c:     application.process.id = "31458"
I: [pulseaudio] source-output.c:     application.process.user = "jka"
I: [pulseaudio] source-output.c:     application.process.host = "dell"
I: [pulseaudio] source-output.c:     application.process.binary = "pavucontrol"
I: [pulseaudio] source-output.c:     application.language = "en_US.UTF-8"
I: [pulseaudio] source-output.c:     window.x11.display = ":0.0"
I: [pulseaudio] source-output.c:     application.process.machine_id = "a296c1aded9e44fb902ab04632a6a2b3"
I: [pulseaudio] source-output.c:     application.process.session_id = "2"
I: [pulseaudio] source-output.c:     module-stream-restore.id = "source-output-by-application-id:org.PulseAudio.pavucontrol"
I: [pulseaudio] protocol-native.c: Final latency 80.00 ms = 40.00 ms + 40.00 ms

Přepnutí výstupu se neprojeví na zátěži CPU, do dmesg ani logů při přepínání zvukovky nic nepřibyde. Možná je tam něco při bootu, ale nevím, co hledat.

Můžete někdo poradit, po čem se dívat?