Crippled battery on new Intel Tigerlake

Hi there,

I've just moved to a new laptop with Debian 11.  However, the battery 
life is terrible (1/5th time compared to running Windows on the same 
machine).  It's an Intel Tigerlake CPU, and I've seen a post [1] 
suggesting that Intel's DTT may be the issue for GNU/Linux.  The fix on 
the post doesn't appear to have worked, is this something anyone has 
encountered?

Approaches like tlp [2] and thermald [3] do not seem to have helped, 
it's not a thermal issue, I believe there needs to be some tuning of the 
kernel to make sure that the Intel DTT is used properly, otherwise it 
eats through the battery.  However, I'm unsure how to do this in Debian, 
and if the kernel is new enough (5.17.0-1-amd64).


Kind regards,
Perry

[1] 
https://www.reddit.com/r/linux/comments/u7zxa0/psa_for_intel_tiger_lake_dynamic_tuning_laptops/
[2] https://linrunner.de/tlp/index.html
[3] https://wiki.debian.org/thermald