the pi engineers updated the rpi-eeprom package with power consumption improvements. Idle temps are reduced by about 4 °C.
The rpi-eeprom package is only supported on Raspbian so for other distributions the maintainers would need to implement a similar package. Since the update is just a shell script it should be reasonably easy for other distributions to either re-package the scripts or roll their own e.g. LibreElec does this.
Can you add this package/script to manjaro, please?