https://www.marcusfolkesson.se/tags/systemd/ Recent content in Systemd on Marcus Folkesson Hugo en-us Fri, 09 Feb 2024 18:39:34 +0200 https://www.marcusfolkesson.se/blog/power-button-and-embedded-linux/ Fri, 09 Feb 2024 18:39:34 +0200 https://www.marcusfolkesson.se/blog/power-button-and-embedded-linux/ Power button and embedded Linux Not all embedded Linux systems has a power button, but for consumer electronic devices it could be a good thing to be able to turn it off. But how does it work in practice? Physical button It all starts with a physical button. At the board level, the button is usually connected to a General-Purpose-Input-Output (GPIO) pin on the processor. It doesn't have to be directly connected to the processor though, all that matters is that the button press can somehow be mapped to the Linux input subsystem.