Ubuntu

systemd-logind only intercepts power button after suspend cycle

Asked by zak-xyzzy

I have a fresh installation of xubuntu 19.04, with all subsequent updates applied, on a Lenovo x120e.

From a fresh boot, I run: journalctl -f
Then press the power button.

Expected behavior is "May 20 21:47:17 xyz systemd-logind[513]: Power key pressed" from journalctl
and whatever action is defined in the XFCE4 power manager (presently set to "ignore")

Actual behavior is system immediately reboots.

Plot twist: If I boot fresh, then run "systemctl suspend", then resume from suspended state by pressing the power button, wait for it all to come back, and THEN repeated the steps above, I get the correct log message from systemd-logind, including suspending if that's how XFCE4 power settings are set.

In summary, either something is pre-empting logind from intercepting the power button press or the "hook", is not registered, from a fresh boot until a suspend/resume cycle is manually initiated.

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zak-xyzzy (zak-xyzzy) said : 		#1

Behavior is identical on 18.04.2.
Happens on another x120e so it's not something weird with this instance of the machine.

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zak-xyzzy (zak-xyzzy) said : 		#2

When the behavior succeeds (ie, the non failing case), the following 4 lines/events are produced by acpi_listen upon a power button press-release:

button/power PBTN 00000080 00000000
button/power PNP0C0C:00 00000080 00000001
button/power PBTN 00000080 00000000
button/power LNXPWRBN:00 00000080 00000001

Where events 1-2 happen during the button depress, and events 3-4 happen upon button release.

When the laptop "immediately restarts" upon pressing the button (IE, does not intercept the events properly), ONLY events 1-2 are reported. Which makes some sense because the reboot is initiated before the button is released. So the PBTN and PNP0C0C events ARE reported through the pipeline.

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zak-xyzzy (zak-xyzzy) said : 		#3

Another thing that happens is that the "Suspend/Shutdown/Reboot/Logout" menu pops up twice (ie, it reoccurs after the first is dismissed) when the power button is pressed and the laptop/OS is in a state that it doesn't reboot immediately. Speculate that this is due to the two PBTN events, one for down, one for up.

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Launchpad Janitor (janitor) said : 		#4

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

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zak-xyzzy (zak-xyzzy) said : 		#5

Issue persists. Suspend function worked fine on much much older version of Ubuntu (10?).

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Launchpad Janitor (janitor) said : 		#6

This question was expired because it remained in the 'Open' state without activity for the last 15 days.