[Test Case]
* install kernel 5.4 and check audio function
1. enable Pre-released updates in Developer Options
Software & Updates > Developer Options > Pre-released updates
(bionic-proposed)
2. $ sudo apt update
3. $ sudo apt install linux-generic-hwe-18.04-edge
4. $ sudo reboot
* install updated linux-firmware and pulseaudio
$ sudo add-apt-repository ppa:kchsieh/training
$ sudo apt-get update
$ sudo apt install linux-firmware
$ sudo apt install pulseaudio
$ sudo reboot
* test items
1. check internal speaker/mic to playback and record audio
2. plug headset and check headset functions
3. plug HDMI from external monitor/TV, and check audio functions
4. 1, 2, 3 works fine after resume from suspend
[Test machines and results]
Lenovo ThinkPad T15, internal speaker/mic, headset functions, HDMI
monitor/TV before/after S3 working normally.
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https://bugs.launchpad.net/bugs/1881094
Title:
Support kernel 5.4 Intel sound driver on bionic
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