Sample
1. In the file /etc/system/logind.conf
HandlePowerKey=poweroff or HandlePowerKey section is none?
(It is set to handlepowerkey=power off or not at all. Also, after configuration change, it should be tested after rebooing.)
2. Please check the evtest result.
# sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: Power Button
/dev/input/event1: Power Button
/dev/input/event2: Logitech Wireless Mouse PID:4022
/dev/input/event3: Logitech Wireless Keyboard PID:4023
Select the device event number [0-3]: 0
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x1 version 0x0
Input device name: "Power Button"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 116 (KEY_POWER)
Properties:
Testing ... (interrupt to exit)
Event: time 1693188960.523333, type 1 (EV_KEY), code 116 (KEY_POWER), value 1
Event: time 1693188960.523333, -------------- SYN_REPORT ------------
Event: time 1693188960.523350, type 1 (EV_KEY), code 116 (KEY_POWER), value 0
Event: time 1693188960.523350, -------------- SYN_REPORT ------------
You can install ‘evetest’ with apt install evtest command.
We received signal after touch power button as like above 'Event :' text
NAME
evtest - Input device event monitor and query tool
SYNOPSIS
evtest [--grab] /dev/input/eventX
evtest --query /dev/input/eventX <type> <value>
DESCRIPTION
The first invocation type displayed above ("capture mode") causes evtest to display
information about the specified input device, including all the events supported by the
device. It then monitors the device and displays all the events layer events generated.
If the --grab flag is given in capture mode, evtest keeps an EVIOCGRAB on the device.
While this grab is active, other processes will not receive events from the kernel
devices. The grab is released again when evtest quits.
In the second invocation type ("query mode"), evtest performs a one-shot query of the
state of a specific key value of an event type.
type is one of: EV_KEY, EV_SW, EV_SND, EV_LED (or the numerical value)
value can be either a decimal representation (e.g. 44), hex (e.g. 0x2c), or the constant
name (e.g. KEY_Z) of the key/switch/sound/LED being queried.
If the state bit is set (key pressed, switch on, ...), evtest exits with code 10. If the
state bit is unset (key depressed, switch off, ...), evtest exits with code 0. No other
output is generated.
evtest needs to be able to read from the device; in most cases this means it must be run
as root.
evtest is commonly used to debug issues with input devices in X.Org. The output of evtest
shows the information presented by the kernel; based on this information it can be
determined whether a bug may be a kernel or an X.Org issue.
DIAGNOSTICS
If evtest does not show any events even though the device is being used, the device may be
grabbed by a process (EVIOCGRAB). This is usually the case when debugging a synaptics
device from within X. VT switching to a TTY or shutting down the X server terminates this
grab and synaptics devices can be debugged.
The following command shows the processes with an open file descriptor on the device:
fuser -v /dev/input/eventX
EXIT CODE
evtest returns 1 on error.
When used to query state, evtest returns 0 if the state bit is unset and 10 if the state
bit is set.
SEE ALSO
inputattach(1)
AUTHOR
evtest was written by Vojtech Pavlik <vojtech@suse.cz[1]>.
This manual page was written by Stephen Kitt <steve@sk2.org[2]>, based on that present in
the lineakd package, for the Debian GNU/Linux system (but may be used by others).
NOTES
1. vojtech@suse.cz
mailto:vojtech@suse.cz
2. steve@sk2.org
mailto:steve@sk2.org
08/22/2019 EVTEST(1)