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this post was submitted on 18 Sep 2023
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If you stick to Flatpak apps you don't even need the codecs on your base system (I've been using it myself this way for a while now). For power management, I personally prefer to layer powertop, which doesn't break power-profiles-daemon and works basically just as well as tlp, but layering tlp is perfectly fine too.
The custom kernel though, that's more complicated (and an understandable limitation to immutability), I'd recommend you look into Universal Blue in your case, as it might be a better solution.
Hmm.. I thought at the very least you needed to layer intel-media-driver for VA-API support for Intel.
Yeah, powertop is essential and should come in the default image. How else are you going to see exactly how much power your machine is using at any time? I wish PPD+Powertop --auto-tune worked for me, but the powersave scheduler it uses lets my Alder-Lake CPU run wild and gives me a good 2-3 less hours of battery life.
I plan on sometime investigating how to make my own image using Universal Blue, because really all I need is Silverblue+Surface Kernel+TLP+Hardware Accelerated Video. But too busy right now.
On my machine at least all I needed was Firefox (and any other video-related apps) from flatpak with the ffmpeg-full libs from flatpak as well.