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#1 2018-05-20 10:18:22
- ddzero
- Member
- Registered: 2018-05-20
- Posts: 2
DisplayPort Audio Passthrough broken - sample rate problem?
Hello,
I have switched to a BENQ EX3501R monitor and would like to use my headphones from the headphone jack on the monitor, which I have connected via DisplayPort.
The issue is that the sound coming from the headphones is distorted: coming from Spotify, it sounds ... slowed/pitched down. My best guess is that the sample rate is off, something like a 44.1 vs 48kHz thing. This thesis may be supported by the fact that a song that should play for 108sec actually plays for about 125sec. I don't know I would fix that though, or whether this is even a likely problem.
In addition, the audio coming from Firefox and VLC is completely broken, I only hear very faint crackling.
I also have speakers connected through normal line out, those work just fine, with both spotify and firefox/vlc.
I use PulseAudio without any non-default configuration.
This is probably too little information to go on, please let me know what logs/configs are needed to diagnose the problem.
Thanks a bunch.
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#2 2018-05-20 11:21:18
- V1del
- Forum Moderator
- Registered: 2012-10-16
- Posts: 25,074
Re: DisplayPort Audio Passthrough broken - sample rate problem?
During problematic playback, post complete outputs of
pacmd list-cards
pacmd list-sinks
pacmd list-sink-inputsOffline
#3 2018-05-21 10:27:35
- ddzero
- Member
- Registered: 2018-05-20
- Posts: 2
Re: DisplayPort Audio Passthrough broken - sample rate problem?
This is during 'slowed down' spotify playback.
[~]$ pacmd list-cards
2 card(s) available.
index: 0
name: <alsa_card.pci-0000_01_00.1>
driver: <module-alsa-card.c>
owner module: 6
properties:
alsa.card = "1"
alsa.card_name = "HDA ATI HDMI"
alsa.long_card_name = "HDA ATI HDMI at 0xefe60000 irq 32"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:01:00.1"
sysfs.path = "/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1"
device.bus = "pci"
device.vendor.id = "1002"
device.vendor.name = "Advanced Micro Devices, Inc. [AMD/ATI]"
device.product.id = "aaa0"
device.product.name = "Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970]"
device.string = "1"
device.description = "Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970]"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
profiles:
output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5400, available: unknown)
output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (priority 5200, available: no)
output:hdmi-surround-extra1: Digital Surround 5.1 (HDMI 2) Output (priority 100, available: no)
output:hdmi-surround71-extra1: Digital Surround 7.1 (HDMI 2) Output (priority 100, available: no)
output:hdmi-stereo-extra2: Digital Stereo (HDMI 3) Output (priority 5200, available: no)
output:hdmi-surround-extra2: Digital Surround 5.1 (HDMI 3) Output (priority 100, available: no)
output:hdmi-surround71-extra2: Digital Surround 7.1 (HDMI 3) Output (priority 100, available: no)
output:hdmi-stereo-extra3: Digital Stereo (HDMI 4) Output (priority 5200, available: no)
output:hdmi-surround-extra3: Digital Surround 5.1 (HDMI 4) Output (priority 100, available: no)
output:hdmi-surround71-extra3: Digital Surround 7.1 (HDMI 4) Output (priority 100, available: no)
output:hdmi-stereo-extra4: Digital Stereo (HDMI 5) Output (priority 5200, available: no)
output:hdmi-surround-extra4: Digital Surround 5.1 (HDMI 5) Output (priority 100, available: no)
output:hdmi-surround71-extra4: Digital Surround 7.1 (HDMI 5) Output (priority 100, available: no)
output:hdmi-stereo-extra5: Digital Stereo (HDMI 6) Output (priority 5200, available: no)
output:hdmi-surround-extra5: Digital Surround 5.1 (HDMI 6) Output (priority 100, available: no)
output:hdmi-surround71-extra5: Digital Surround 7.1 (HDMI 6) Output (priority 100, available: no)
off: Off (priority 0, available: unknown)
active profile: <output:hdmi-stereo>
sinks:
alsa_output.pci-0000_01_00.1.hdmi-stereo/#0: Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970] Digital Stereo (HDMI)
sources:
alsa_output.pci-0000_01_00.1.hdmi-stereo.monitor/#0: Monitor of Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970] Digital Stereo (HDMI)
ports:
hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: yes)
properties:
device.icon_name = "video-display"
hdmi-output-1: HDMI / DisplayPort 2 (priority 5800, latency offset 0 usec, available: no)
properties:
device.icon_name = "video-display"
hdmi-output-2: HDMI / DisplayPort 3 (priority 5700, latency offset 0 usec, available: no)
properties:
device.icon_name = "video-display"
hdmi-output-3: HDMI / DisplayPort 4 (priority 5600, latency offset 0 usec, available: no)
properties:
device.icon_name = "video-display"
hdmi-output-4: HDMI / DisplayPort 5 (priority 5500, latency offset 0 usec, available: no)
properties:
device.icon_name = "video-display"
hdmi-output-5: HDMI / DisplayPort 6 (priority 5400, latency offset 0 usec, available: no)
properties:
device.icon_name = "video-display"
index: 1
name: <alsa_card.pci-0000_00_1b.0>
driver: <module-alsa-card.c>
owner module: 7
properties:
alsa.card = "0"
alsa.card_name = "HDA Intel PCH"
alsa.long_card_name = "HDA Intel PCH at 0xeff30000 irq 31"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:1b.0"
sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
device.bus = "pci"
device.vendor.id = "8086"
device.vendor.name = "Intel Corporation"
device.product.id = "8c20"
device.product.name = "8 Series/C220 Series Chipset High Definition Audio Controller"
device.form_factor = "internal"
device.string = "0"
device.description = "Built-in Audio"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
profiles:
input:analog-stereo: Analog Stereo Input (priority 60, available: no)
output:analog-stereo: Analog Stereo Output (priority 6000, available: unknown)
output:analog-stereo+input:analog-stereo: Analog Stereo Duplex (priority 6060, available: unknown)
output:analog-surround-21: Analog Surround 2.1 Output (priority 800, available: unknown)
output:analog-surround-21+input:analog-stereo: Analog Surround 2.1 Output + Analog Stereo Input (priority 860, available: unknown)
output:analog-surround-40: Analog Surround 4.0 Output (priority 700, available: unknown)
output:analog-surround-40+input:analog-stereo: Analog Surround 4.0 Output + Analog Stereo Input (priority 760, available: unknown)
output:analog-surround-41: Analog Surround 4.1 Output (priority 800, available: unknown)
output:analog-surround-41+input:analog-stereo: Analog Surround 4.1 Output + Analog Stereo Input (priority 860, available: unknown)
output:analog-surround-50: Analog Surround 5.0 Output (priority 700, available: unknown)
output:analog-surround-50+input:analog-stereo: Analog Surround 5.0 Output + Analog Stereo Input (priority 760, available: unknown)
output:analog-surround-51: Analog Surround 5.1 Output (priority 800, available: unknown)
output:analog-surround-51+input:analog-stereo: Analog Surround 5.1 Output + Analog Stereo Input (priority 860, available: unknown)
output:analog-surround-71: Analog Surround 7.1 Output (priority 700, available: unknown)
output:analog-surround-71+input:analog-stereo: Analog Surround 7.1 Output + Analog Stereo Input (priority 760, available: unknown)
output:iec958-stereo: Digital Stereo (IEC958) Output (priority 5500, available: unknown)
output:iec958-stereo+input:analog-stereo: Digital Stereo (IEC958) Output + Analog Stereo Input (priority 5560, available: unknown)
off: Off (priority 0, available: unknown)
active profile: <output:analog-stereo+input:analog-stereo>
sinks:
alsa_output.pci-0000_00_1b.0.analog-stereo/#1: Built-in Audio Analog Stereo
sources:
alsa_output.pci-0000_00_1b.0.analog-stereo.monitor/#1: Monitor of Built-in Audio Analog Stereo
alsa_input.pci-0000_00_1b.0.analog-stereo/#2: Built-in Audio Analog Stereo
ports:
analog-input-front-mic: Front Microphone (priority 8500, latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-rear-mic: Rear Microphone (priority 8200, latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: no)
properties:
analog-output-lineout: Line Out (priority 9900, latency offset 0 usec, available: yes)
properties:
analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-headphones"
iec958-stereo-output: Digital Output (S/PDIF) (priority 0, latency offset 0 usec, available: unknown)
properties:
[~]$ pacmd list-sinks
2 sink(s) available.
index: 0
name: <alsa_output.pci-0000_01_00.1.hdmi-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE DECIBEL_VOLUME LATENCY
state: RUNNING
suspend cause:
priority: 9030
volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 100.12 ms
max request: 17 KiB
max rewind: 17 KiB
monitor source: 0
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 1
linked by: 1
fixed latency: 100.14 ms
card: 0 <alsa_card.pci-0000_01_00.1>
module: 6
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "HDMI 0"
alsa.id = "HDMI 0"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "3"
alsa.card = "1"
alsa.card_name = "HDA ATI HDMI"
alsa.long_card_name = "HDA ATI HDMI at 0xefe60000 irq 32"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:01:00.1"
sysfs.path = "/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1"
device.bus = "pci"
device.vendor.id = "1002"
device.vendor.name = "Advanced Micro Devices, Inc. [AMD/ATI]"
device.product.id = "aaa0"
device.product.name = "Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970]"
device.string = "hdmi:1"
device.buffering.buffer_size = "17664"
device.buffering.fragment_size = "2944"
device.access_mode = "mmap"
device.profile.name = "hdmi-stereo"
device.profile.description = "Digital Stereo (HDMI)"
device.description = "Tahiti HDMI Audio [Radeon HD 7870 XT / 7950/7970] Digital Stereo (HDMI)"
alsa.mixer_name = "ATI R6xx HDMI"
alsa.components = "HDA:1002aa01,00aa0100,00100300"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: yes)
properties:
device.icon_name = "video-display"
active port: <hdmi-output-0>
* index: 1
name: <alsa_output.pci-0000_00_1b.0.analog-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9039
volume: front-left: 42152 / 64% / -11.50 dB, front-right: 42152 / 64% / -11.50 dB
balance 0.00
base volume: 65536 / 100% / 0.00 dB
volume steps: 65537
muted: no
current latency: 0.00 ms
max request: 0 KiB
max rewind: 0 KiB
monitor source: 1
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 0
fixed latency: 99.95 ms
card: 1 <alsa_card.pci-0000_00_1b.0>
module: 7
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "ALC1150 Analog"
alsa.id = "ALC1150 Analog"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "0"
alsa.card_name = "HDA Intel PCH"
alsa.long_card_name = "HDA Intel PCH at 0xeff30000 irq 31"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:1b.0"
sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
device.bus = "pci"
device.vendor.id = "8086"
device.vendor.name = "Intel Corporation"
device.product.id = "8c20"
device.product.name = "8 Series/C220 Series Chipset High Definition Audio Controller"
device.form_factor = "internal"
device.string = "front:0"
device.buffering.buffer_size = "17632"
device.buffering.fragment_size = "4408"
device.access_mode = "mmap"
device.profile.name = "analog-stereo"
device.profile.description = "Analog Stereo"
device.description = "Built-in Audio Analog Stereo"
alsa.mixer_name = "Realtek ALC1150"
alsa.components = "HDA:10ec0900,10438560,00100001"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
analog-output-lineout: Line Out (priority 9900, latency offset 0 usec, available: yes)
properties:
analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-headphones"
active port: <analog-output-lineout>
[~]$ pacmd list-sink-inputs
1 sink input(s) available.
index: 0
driver: <protocol-native.c>
flags: START_CORKED
state: RUNNING
sink: 0 <alsa_output.pci-0000_01_00.1.hdmi-stereo>
volume: front-left: 39321 / 60% / -13.31 dB, front-right: 39321 / 60% / -13.31 dB
balance 0.00
muted: no
current latency: 1011.86 ms
requested latency: 100.14 ms
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
resample method: (null)
module: 9
client: 3 <Spotify>
properties:
media.role = "music"
media.name = "Spotify"
application.name = "Spotify"
native-protocol.peer = "UNIX socket client"
native-protocol.version = "32"
application.process.id = "1774"
application.process.user = "david"
application.process.host = "ArchDavid"
application.process.binary = "spotify"
window.x11.display = ":0"
application.language = "en_US.UTF-8"
application.process.machine_id = "aea77af0a6fa4fb8b14b125c2568ea8e"
application.process.session_id = "c2"
application.icon_name = "spotify-client"
module-stream-restore.id = "sink-input-by-media-role:music"Offline