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Using 14.04, i have intermittent issues with audio (works then stops), tried many tips (and actually reverted from 16.04 to a fresh 14.04) but it's still there...

Question

When applying the troubleshooting procedure, i noticed that the driver is referenced with different names in different places using dash or underscore : "snd-hda-intel" in sound modules, "snd_hda_intel" in hardware devices.

Why these different names ? could this have an impact ?

Thanks for your help

Sound module

find /lib/modules/uname -r | grep snd | grep hda | grep intel

/lib/modules/4.4.0-36-generic/kernel/sound/pci/hda/snd-hda-intel.ko

Physical audio hardware

lspci -v | grep -A5 -i "audio"

00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04) Subsystem: Intel Corporation Device 204f Flags: bus master, fast devsel, latency 0, IRQ 29 Memory at f7d30000 (64-bit, non-prefetchable) [size=16K] Capabilities: Kernel driver in use: snd_hda_intel

Soundplay cards and devices

aplay -l

**** List of PLAYBACK Hardware Devices **** card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2] Subdevices: 1/1 Subdevice #0: subdevice #0

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I had similar problems with intermittent audio where the device was listed in aplay -l but there was still no sound. Output from dmesg showed the real issue:

snd_hda_intel: azx_get_response timeout, switching to polling mode: last cmd=0x01270700
snd_hda_intel: No response from codec, disabling MSI: last cmd=0x01270700
snd_hda_intel: azx_get_response timeout, switching to single_cmd mode: last cmd=0x01270700

To fix it by adding this line in /etc/modprobe.d/alsa-base.conf:

options snd-hda-intel probe_mask=1

Source: https://help.ubuntu.com/community/HdaIntelSoundHowto#Playing_with_probe_mask

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