This might be a kernel issue and not just a problem with Ubuntu since
I've had this exact same issue on an HP Envy 13 i5 Kaby Lake running
ALC295 on pretty much every distro. Back when I'd dual boot, I used to
boot into Windows before booting back into Linux to fix this problem and
it worked on every distro. Now I have a machine with only Linux on it
can't seem to make this issue go away. Here's a list of the audio
devices used.

Audio device: Intel Corporation Device 9d71 (rev 21) (prog-if 80)
        Subsystem: Hewlett-Packard Company Device 82b9
        Flags: bus master, fast devsel, latency 32, IRQ 132
        Memory at a1328000 (64-bit, non-prefetchable) [size=16K]
        Memory at a1310000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel, snd_soc_skl

**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC295 Analog [ALC295 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
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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https://bugs.launchpad.net/bugs/1648183

Title:
  Crackling and popping sound when using headphones

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