Investigate/pull in updated PinePhone WLAN driver mentioned by megi
I've found a very recent rtl8723cs driver in some rockchip kernel tree on github. The driver is just slightly more than a month old, and I was able to enable power saving in it. This saves 350mW when the WiFi is idle, without any negative side effect that were present with the old driver.
Commit: https://megous.com/git/linux/commit/?h=wifi-5.10&id=0810b7186aeb4389b6286d87c7748fc9fe6f5a91