Skip to content

Add note about adjusting Pi5 fan speeds #4121

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Jul 24, 2025
Merged

Add note about adjusting Pi5 fan speeds #4121

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions documentation/asciidoc/computers/raspberry-pi/frequency-management.adoc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,8 @@ As the temperature of the Raspberry Pi 5 increases, the fan reacts in the follow

Temperature decreases use the same mapping with a 5°C **hysteresis**; fan speed decreases when the temperature drops to 5°C below each of the above thresholds.

NOTE: The temperature, hysteresis and speed figures given above can be adjusted by using the various `fan_tempN`, `fan_tempN_hyst` and `fan_tempN_speed` dtoverlay settings (where `N` is 0, 1, 2 or 3). See https://github.com/raspberrypi/linux/blob/rpi-6.12.y/arch/arm/boot/dts/overlays/README[the overlays README] for full details. For example, adding `dtparam=fan_temp0=55000` to `/boot/firmware/config.txt` will cause the fan to remain off until the Raspberry Pi 5's temperature reaches 55°C.

At boot the fan is turned on, and the tachometer input is checked to see if the fan is spinning. If it is, then the `cooling_fan` device tree overlay is enabled. This overlay is in `bcm2712-rpi-5-b.dtb` by default, but with `status=disabled`.

==== Raspberry Pi 5 fan connector pinout
Expand Down