https://wccftech.com/firmware-update-1-2238-140-0-for-surface-laptop-3-with-amd-processor/

Microsoft has released a new firmware update for Surface Laptop 3 running Windows 10 May 2019 Update, version 1903 or greater. Firmware update 1.2238.140.0 improves system stability and battery life for devices with AMD chips.

Not every Surface device receives a new update at the same time, as the Windows maker delivers these updates in stages. Before proceeding to download and install the latest Surface Laptop 3 update 1.2238.140.0, note that you won't be able to uninstall or revert a firmware update back to an earlier version. There are, however, no known issues at the moment.