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====== Ubuntu - Sound - Troubleshooting ======

Try this first:

<code bash>
killall pulseaudio; pulseaudio -k  ; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*
</code>

Wait ten seconds, then run this:

<code bash>
pulseaudio --start
</code>

----

Should the approach above fail to correct the problem (it is only known to work on some variations), you can try this next:

<code bash>
killall pulseaudio; pulseaudio -k; rm -r ~/.config/pulse/* ; rm -r ~/.pulse*
</code>

wait 10 seconds, then reboot (putting the machine to sleep is not enough -- fully power it off and then back on).

<WRAP info>
**NOTE:**  Make sure to save your work first.
</WRAP>

----

====== Get info from dmesg ======

<code bash>
dmesg | grep "snd\|sound" -i
</code>

returns:

<code bash>
[    7.673796] snd_hda_intel 0000:09:00.1: Disabling MSI
[    7.673802] snd_hda_intel 0000:09:00.1: Handle vga_switcheroo audio client
[    7.673864] snd_hda_intel 0000:0b:00.4: enabling device (0000 -> 0002)
[    7.689821] snd_hda_codec_realtek hdaudioC2D0: autoconfig for ALC1220: line_outs=3 (0x1b/0x15/0x16/0x0/0x0) type:line
[    7.689823] snd_hda_codec_realtek hdaudioC2D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    7.689824] snd_hda_codec_realtek hdaudioC2D0:    hp_outs=1 (0x14/0x0/0x0/0x0/0x0)
[    7.689825] snd_hda_codec_realtek hdaudioC2D0:    mono: mono_out=0x0
[    7.689825] snd_hda_codec_realtek hdaudioC2D0:    dig-out=0x1e/0x0
[    7.689826] snd_hda_codec_realtek hdaudioC2D0:    inputs:
[    7.689827] snd_hda_codec_realtek hdaudioC2D0:      Front Mic=0x19
[    7.689828] snd_hda_codec_realtek hdaudioC2D0:      Rear Mic=0x18
[    7.689829] snd_hda_codec_realtek hdaudioC2D0:      Line=0x1a
[    7.701710] input: HD-Audio Generic Front Mic as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input11
[    7.701824] input: HD-Audio Generic Rear Mic as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input12
[    7.701942] input: HD-Audio Generic Line as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input13
[    7.702061] input: HD-Audio Generic Line Out Front as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input14
[    7.702188] input: HD-Audio Generic Line Out Surround as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input15
[    7.702317] input: HD-Audio Generic Line Out CLFE as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input16
[    7.702514] input: HD-Audio Generic Front Headphone as /devices/pci0000:00/0000:00:08.1/0000:0b:00.4/sound/card2/input17
[    7.948602] usbcore: registered new interface driver snd-usb-audio
[    9.392299] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.1/0000:09:00.1/sound/card0/input18
[    9.392341] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.1/0000:09:00.1/sound/card0/input19
[    9.392431] input: HDA NVidia HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.1/0000:09:00.1/sound/card0/input20
[    9.392471] input: HDA NVidia HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:03.1/0000:09:00.1/sound/card0/input21
[    9.392507] input: HDA NVidia HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:03.1/0000:09:00.1/sound/card0/input22
[    9.392553] input: HDA NVidia HDMI/DP,pcm=11 as /devices/pci0000:00/0000:00:03.1/0000:09:00.1/sound/card0/input23
[   22.099789] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 7
</code>

<WRAP info>
**NOTE:** This indicates **card0** and **card2**.
</WRAP>

----

====== Identify the card module ======

<code bash>
lspci -k | grep Audio -A4
</code>

returns:

<code bash>
09:00.1 Audio device: NVIDIA Corporation GP107GL High Definition Audio Controller (rev a1)
	Subsystem: Micro-Star International Co., Ltd. [MSI] GP107GL High Definition Audio Controller
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel
0a:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Function
	Subsystem: Advanced Micro Devices, Inc. [AMD] Starship/Matisse PCIe Dummy Function
--
0b:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller
	Subsystem: Gigabyte Technology Co., Ltd Starship/Matisse HD Audio Controller
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel
</code>



<WRAP info>
**NOTE:**  Often this is **snd_hda_intel**.
</WRAP>

----

====== Identify the cards ======

<code bash>
cat /proc/asound/cards*
</code>

returns:

<code bash>
 0 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xfb080000 irq 124
 2 [Generic        ]: HDA-Intel - HD-Audio Generic
                      HD-Audio Generic at 0xfc200000 irq 126
</code>



<WRAP info>
**NOTE:** This indicates **0** and **2**.
</WRAP>



----


====== Identify the card codec ======

<code bash>
head -1 /proc/asound/card*/codec*
</code>

returns:

<code bash>
==> /proc/asound/card0/codec#0 <==
Codec: Nvidia GPU 80 HDMI/DP

==> /proc/asound/card2/codec#0 <==
Codec: Realtek ALC1220
</code>



<WRAP info>
**NOTE:** This indicates **card0** and **card2**.
</WRAP>



----


====== Get info from aplay ======

<code bash>
aplay -l
</code>

returns:

<code bash>
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 10: HDMI 4 [HDMI 4]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 11: HDMI 5 [HDMI 5]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Generic [HD-Audio Generic], device 0: ALC1220 Analog [ALC1220 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 2: Generic [HD-Audio Generic], device 1: ALC1220 Digital [ALC1220 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
</code>



<WRAP info>
**NOTE:** This indicates **card 0** and **card 2**.
</WRAP>



----



===== References =====

https://help.ubuntu.com/community/SoundTroubleshootingProcedure

https://answers.launchpad.net/ubuntu/+source/alsa-driver/+addquestion