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I have an Ubuntu 18.04 installed on my DELL 7490 laptop.
Kernel version is: 5.3.0-40-generic

When I plug in one of my headphones and start to play sound I
immediately start to hear white noise in the earphone. After I stop the
music the white noise still remains for 5 more seconds, after 5 seconds
it stops.

I tried with different headphones, the only difference between them is
the volume of the white noise.

I tried several ways to fix the problem but without any luck.

lspci -nnk | grep -iA2 audio output:
00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-LP HD Audio 
[8086:9d71] (rev 21)
        Subsystem: Dell Sunrise Point-LP HD Audio [1028:081c]
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel, snd_soc_skl
sudo aplay -l output:
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC3246 Analog [ALC3246 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
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Thanks for your help in advance!

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: alc3246 bot-comment dell headphones hiss noise white
-- 
White noise during sound playing and after sound stopped for 5 seconds in 
headphones
https://bugs.launchpad.net/bugs/1869080
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