I can add some information to this bug (or what seems to be a bunch of related audio bugs).
In my case it is related to my sound card, switching to and from the soundcard audio causes the bug to appear and disappear.
Line-Out - Built-in Audio : No bug Digital Output (S/PDIF) - EMU20k2 [Sound Blaster X-Fi Titanium Series] : Occasionally garbled audio
I've added more info about my hardware devices and drivers:
lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05) 01:00.1 Audio device: NVIDIA Corporation GP102 HDMI Audio Controller (rev a1) 03:00.0 Audio device: Creative Labs EMU20k2 [Sound Blaster X-Fi Titanium Series] (rev 04)
sudo lshw -C sound
*-multimedia description: Audio device product: GP102 HDMI Audio Controller vendor: NVIDIA Corporation physical id: 0.1 bus info: pci@0000:01:00.1 version: a1 width: 32 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=snd_hda_intel latency=0 resources: irq:17 memory:fb080000-fb083fff *-usb description: Audio device product: HD Webcam C615 vendor: Logitech, Inc. physical id: 2 bus info: usb@1:1.2 version: 0.11 serial: 27A1DFD0 capabilities: usb-2.00 audio-control configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s *-multimedia description: Audio device product: 6 Series/C200 Series Chipset Family High Definition Audio Controller vendor: Intel Corporation physical id: 1b bus info: pci@0000:00:1b.0 version: 05 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=snd_hda_intel latency=0 resources: irq:34 memory:f9300000-f9303fff *-multimedia description: Audio device product: EMU20k2 [Sound Blaster X-Fi Titanium Series] vendor: Creative Labs physical id: 0 bus info: pci@0000:03:00.0 version: 04 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list configuration: driver=snd_ctxfi latency=0 resources: irq:17 memory:f9200000-f920ffff memory:f9000000-f91fffff memory:f8000000-f8ffffff
I can add some information to this bug (or what seems to be a bunch of related audio bugs).
In my case it is related to my sound card, switching to and from the soundcard audio causes the bug to appear and disappear.
Line-Out - Built-in Audio : No bug
Digital Output (S/PDIF) - EMU20k2 [Sound Blaster X-Fi Titanium Series] : Occasionally garbled audio
I've added more info about my hardware devices and drivers:
lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
01:00.1 Audio device: NVIDIA Corporation GP102 HDMI Audio Controller (rev a1)
03:00.0 Audio device: Creative Labs EMU20k2 [Sound Blaster X-Fi Titanium Series] (rev 04)
sudo lshw -C sound
*-multimedia
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver= snd_hda_ intel latency=0 fb080000- fb083fff
capabilities: usb-2.00 audio-control
configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver= snd_hda_ intel latency=0 f9300000- f9303fff
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_ctxfi latency=0 f9200000- f920ffff memory: f9000000- f91fffff memory: f8000000- f8ffffff
description: Audio device
product: GP102 HDMI Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
resources: irq:17 memory:
*-usb
description: Audio device
product: HD Webcam C615
vendor: Logitech, Inc.
physical id: 2
bus info: usb@1:1.2
version: 0.11
serial: 27A1DFD0
*-multimedia
description: Audio device
product: 6 Series/C200 Series Chipset Family High Definition Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 05
width: 64 bits
clock: 33MHz
resources: irq:34 memory:
*-multimedia
description: Audio device
product: EMU20k2 [Sound Blaster X-Fi Titanium Series]
vendor: Creative Labs
physical id: 0
bus info: pci@0000:03:00.0
version: 04
width: 64 bits
clock: 33MHz
resources: irq:17 memory: