To check the power state of the dGPU, you can either use framework’s python script for Fedora here or simply
cat /sys/class/drm/card1/device/power/runtime_status
it should show suspended if not in use. If it says active instead despite nothing obvious is using it, it may be due to lm-sensors querying it in the background or even periodically through some sensor widget. On mine, it was gnome-shell-extension-sensors / gnome-shell-extension-freon and I was able to ignore the dGPU in lm-sensors, see Arch Linux on the Framework Laptop 16 - #91 by motzky80 above.