[Bug 1869819] [NEW] [SRU] System can't detect external headset in the codec of Conexant

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[Impact]
In some hp's devices, there are two audio jacks(one headset and one headphone) in the audio interface which is using the codec of Conexant, and apparently it's not working, the system can't detect the headset in current codec.

[Test Case]
1. Insert 4 rings(3 stripes) headset into front audio port (headset icon)
2. Check System Setting->Sound->Output

[Expected result]
Can detect external headset

[Actual result]
Only shows internal speaker.
External headset microphone was detected.
Another front audio port (earphone icon) works fine.

[Regression Potential]
Low.

[Failure rate]
100%

[Additional information]
system-product-name: HP EliteDesk 800 G5 SFF
CPU: Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz (8x)
GPU: 00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:3e98] (rev 02)
OS-version: 18.04
kernel-version: 4.15.0-1065-oem
pulseaudio-version: 1:11.1-1ubuntu7.2

Upstream issue:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/272

Ubuntu-Focal-Source:
https://code.launchpad.net/~hugh712/ubuntu/+source/pulseaudio/+git/pulseaudio/+ref/focal-1869819

PPA: https://launchpad.net/~hugh712/+archive/ubuntu/sru-1869819

** Affects: oem-priority
     Importance: Critical
     Assignee: hugh chao (hugh712)
         Status: Confirmed

** Affects: oem-priority/bionic
     Importance: Undecided
         Status: New

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
     Assignee: hugh chao (hugh712)
         Status: In Progress

** Affects: pulseaudio (Ubuntu Bionic)
     Importance: Undecided
     Assignee: hugh chao (hugh712)
         Status: Triaged

** Affects: pulseaudio (Ubuntu Focal)
     Importance: Undecided
     Assignee: hugh chao (hugh712)
         Status: In Progress


** Tags: originate-from-1856828 patch stella verification-needed
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[SRU] System can't detect external headset in the codec of Conexant
https://bugs.launchpad.net/bugs/1869819
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