From the little experience i have, i had to patch my dsdt to make audio work permanently.I am on HP pavilion power 15 cb035wm also with ALC295.
my audio never worked before even on mojave with the right layout ID but after upgrading to catalina 10.15.1 i patched my dsdt to make battery and audio...
Use this link https://www.tonymacx86.com/threads/readme-common-problems-and-workarounds-on-10-14-mojave.255823/
and follow the guides there carefully. it is for mojave but i used the same fix for my catalina and i am good.
everything works except audio which i am currently working on.
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