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When I have more than one audio source open i.e. VLC + skype, skype + netflix, the later fails to produce any output -- even if the former is paused. I haven't done anything none standard with my configuration in this regard.
lspsci
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0lsmod
snd_seq 61165 0
snd_seq_device 13307 1 snd_seq
snd_hda_codec_hdmi 49263 1
snd_hda_codec_realtek 67322 1
snd_hda_codec_generic 63161 1 snd_hda_codec_realtek
snd_hda_intel 26387 6
snd_hda_controller 26857 1 snd_hda_intel
snd_hda_codec 112621 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_hwdep 17244 1 snd_hda_codec
snd_pcm 88779 5 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller
snd_timer 26614 3 snd_pcm,snd_seq
snd 73436 21 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,thinkpad_acpi,snd_seq_device
soundcore 13031 2 snd,snd_hda_codecOffline