I recently received the 3rd gen HDMI card and did some small power tests using powertop.
Circumstances: Wifi & Bluetooth deactivated, closed all running software, lowest brightness, aggressive TLP settings, no expansion cards (except for the tested HDMI card), Fedora 39 Gnome, Bios 3.08 beta. I’ve plugged in a card, letting it settle for 2 minutes, and noted down 8 power draw values.
Both cards (1st and 3rd gen) got the USB ID 32ac:0002.
Laptop Idle:
2.18 to 2.28W, Avg: 2.22W
1st gen HDMI Card (autosuspend deactivated, default on linux):
2.66 to 2.73W, Avg: 2.67W
3rd gen HDMI Card (autosuspend deactivated, default on linux):
2.51 to 2.68W, Avg: 2.57W
1st gen HDMI Card (autosuspend activated):
2.35 to 2.42W, Avg: 2.38W
3rd gen HDMI Card (autosuspend activated):
2.17 to 2.32W, Avg: 2.23W
So in both cases (autosuspend activated/deactivated) the new 3rd gen card seems to draw 100 to 150 mW less.
Activating autosuspend reduces the power draw by ~300 to 350 mW for both cards. 3rd gen comes very cloth to idle power draw with autosuspend activated.
Be aware that autosuspend on the card might result in an unstable system.
The results for the 1st gen card seem to be in line with: Framework 12th gen laptop review - anarcat