[BUG] Embedded Imager on Pi5 runs fan at full-tilt

[lurch]

Describe the bug
When running Embedded Imager (network OS installer) on a Raspberry Pi 5 with an Active Cooler attached, the fan is running full-speed the whole time, which is slightly annoying. I'm sure that writing an OS image to an SD-card can't be very CPU-intensive!

To Reproduce
Connect up power to a Pi 5 with a blank micro SD card inserted, connected to a USB keyboard, USB mouse, HDMI monitor and Ethernet cable. Follow the on-screen instructions to load the embedded version of RPi Imager.

Expected behaviour
The fan should turn off if the CPU is under low-load (just like it does in Raspberry Pi OS).

Screenshots or video
If applicable, add screenshots or a video to help explain your problem.

Desktop (please complete the following information):

• OS: None!

The name of the OS you are trying to write
Raspberry Pi OS 64-bit

Are you using OS Customisation?
Yes, but that doesn't matter

Additional context
Add any other context about the problem here.

[timg236]

It’s possibly missing the fan dt overlay.