Difference between revisions of "Application note - Example code for capturing power button event on fitlet2 running Linux"
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− | + | * This application note provides an example of how to capture a power button click event on Linux. | |
+ | * It has been tested with the below setup: | ||
+ | <pre> | ||
+ | Device: fitlet2 | ||
+ | CPU: Intel(R) Atom(TM) Processor E3950 | ||
+ | BIOS: 09/17/2018 American Megatrends Inc. FLT2.0.46.01.00 | ||
+ | OS: Debian Buster (testing) | ||
+ | Kernel: 4.16.0-2-amd64 | ||
+ | ISO: debian-buster-DI-alpha3-amd64-netinst.iso | ||
+ | </pre> | ||
+ | |||
+ | == fitlet2: required BIOS settings == | ||
+ | * Press [Delete] button after power-on to enter BIOS settings | ||
+ | * Set BIOS -> Main -> OS selection to [Linux] | ||
+ | |||
+ | == Configure power button event handling == | ||
+ | * Login as root user (root password required): | ||
+ | <pre> | ||
+ | $ su - | ||
+ | Password: | ||
+ | </pre> | ||
+ | |||
+ | * Ignore power button events handling by systemd, then reboot: | ||
+ | <pre> | ||
+ | $ sed -i s/".*HandlePowerKey.*"/"HandlePowerKey=ignore"/ /etc/systemd/logind.conf | ||
+ | $ reboot | ||
+ | </pre> | ||
+ | |||
+ | * Install ACPI related software: | ||
+ | <pre> | ||
+ | $ apt install acpi-support-base acpid | ||
+ | </pre> | ||
+ | |||
+ | * Verify acpi events are visible in the system, run acpi_listen command and press power button 2-3 times: | ||
+ | <pre> | ||
+ | $ acpi_listen | ||
+ | button/power PBTN 00000080 00000000 | ||
+ | button/power LNXPWRBN:00 00000080 00000007 | ||
+ | button/power PBTN 00000080 00000000 | ||
+ | button/power LNXPWRBN:00 00000080 00000008 | ||
+ | </pre> | ||
+ | NOTE #1: current power button handler is /etc/acpi/powerbtn-acpi-support.sh, but it does not work for some reason | ||
+ | |||
+ | NOTE #2: there are 2 events PBTN and LNXPWRBN, we need to handle only one of them, for example PBTN | ||
+ | * Create custom power button event rule: | ||
+ | <pre> | ||
+ | $ cat > /etc/acpi/events/powerbtn-custom-rule << EOF | ||
+ | event=power (PBTN) | ||
+ | action=/etc/acpi/powerbtn-custom-handler.sh | ||
+ | EOF | ||
+ | </pre> | ||
+ | |||
+ | * Create custom power button event handler and make it executable: | ||
+ | <pre> | ||
+ | $ cat > /etc/acpi/powerbtn-custom-handler.sh << EOF | ||
+ | #!/bin/sh | ||
+ | echo "Hello from PBTN!" > /dev/tty1 | ||
+ | EOF | ||
+ | |||
+ | $ chmod +x /etc/acpi/powerbtn-custom-handler.sh | ||
+ | </pre> | ||
+ | |||
+ | * Restart acpid service to activate the new functionality: | ||
+ | <pre> | ||
+ | $ service acpid restart | ||
+ | </pre> | ||
+ | |||
+ | * Press power button shortly, you should see "Hello from PBTN!" on the main console |
Latest revision as of 08:34, 17 October 2018
- This application note provides an example of how to capture a power button click event on Linux.
- It has been tested with the below setup:
Device: fitlet2 CPU: Intel(R) Atom(TM) Processor E3950 BIOS: 09/17/2018 American Megatrends Inc. FLT2.0.46.01.00 OS: Debian Buster (testing) Kernel: 4.16.0-2-amd64 ISO: debian-buster-DI-alpha3-amd64-netinst.iso
fitlet2: required BIOS settings
- Press [Delete] button after power-on to enter BIOS settings
- Set BIOS -> Main -> OS selection to [Linux]
Configure power button event handling
- Login as root user (root password required):
$ su - Password:
- Ignore power button events handling by systemd, then reboot:
$ sed -i s/".*HandlePowerKey.*"/"HandlePowerKey=ignore"/ /etc/systemd/logind.conf $ reboot
- Install ACPI related software:
$ apt install acpi-support-base acpid
- Verify acpi events are visible in the system, run acpi_listen command and press power button 2-3 times:
$ acpi_listen button/power PBTN 00000080 00000000 button/power LNXPWRBN:00 00000080 00000007 button/power PBTN 00000080 00000000 button/power LNXPWRBN:00 00000080 00000008
NOTE #1: current power button handler is /etc/acpi/powerbtn-acpi-support.sh, but it does not work for some reason
NOTE #2: there are 2 events PBTN and LNXPWRBN, we need to handle only one of them, for example PBTN
- Create custom power button event rule:
$ cat > /etc/acpi/events/powerbtn-custom-rule << EOF event=power (PBTN) action=/etc/acpi/powerbtn-custom-handler.sh EOF
- Create custom power button event handler and make it executable:
$ cat > /etc/acpi/powerbtn-custom-handler.sh << EOF #!/bin/sh echo "Hello from PBTN!" > /dev/tty1 EOF $ chmod +x /etc/acpi/powerbtn-custom-handler.sh
- Restart acpid service to activate the new functionality:
$ service acpid restart
- Press power button shortly, you should see "Hello from PBTN!" on the main console