Crippled battery using Linux with Intel Tigerlake

I've just moved to a new laptop with Debian 11. However, the battery life is terrible (1/5th time compared to running Windows). It's an Intel Tigerlake CPU (ThinkPad P14s Gen 2), and I've seen a post suggesting that Intel's DTT may be the issue for GNU/Linux. The fix on the post doesn't appear to have worked for me, namely setting: sudo sysctl dev.i915.perf_stream_paranoid=0 # temporarily or creating a file 60-mdapi.conf in /etc/sysctl.d/ then containing: dev.i915.perf_stream_paranoid=0 Approaches like tlp and thermald do not seem to have helped, it's not a thermal issue. I believe there needs

Question by Prunus Persica on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.