I've performed measurements with turbostat (kernel 5.13)
With new thermald ("bad" game performance):
GFXAMHz: 400, PgkWatt: 16.56, CorWatt: 7.34, GFXWatt: 3.88
With old thermald (good performance):
GFXAMhz: 650, PkgWatt: 14.86 CorWatt: 3.81, GFXWatt: 4.45

About game mode daemon: I have gamemode installed but I'm not sure
whether it is actually used. I remind that have it installed just in
case, but I heard about this program (it is useful for AMD CPUs with
discrete GPUs to set "performance" CPU governor during playing)

It could be a good idea to utilize it, however I have a concern that
most of "typical users" who want to play on their laptops don't know
about this program.

** Attachment added: "with new thermald"
   
https://bugs.launchpad.net/ubuntu/+source/thermald/+bug/1944389/+attachment/5531775/+files/new.jpg

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https://bugs.launchpad.net/bugs/1944389

Title:
  Thermald 1.9.1-1ubuntu0.6 keeps Tigerlake GPU frequency on 400 MHz

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