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When Red Hat Enterprise Linux 8 is booted, a "Momentary Press" of the power button causes a "Power Button Event" to be sent to the operating system.There are multiple ways a "Momentary Press" can be initiated:The iLO 6 Web Interface -> PowerButton -> Momentary PressThe iLO 6 Virtual VGA -> Power -> Momentary PressThe physical power button on the system case.The Linux command: ilorest reboot PushPowerButtonThe Linux command: ipmitool chassis power softIn the context of this issue, the above are all equivalent.In response to a Power Button Event, the operating system can be configured to do:Option 1: "Nothing". That is ignore the event.Option 2: "Power off" the server.Option 3: "Suspend" the operating system. (A subsequent "Momentary Press" will resume the operating system.)Option 4: "Hibernate" the operating system. (A subsequent "Momentary Press" will resume the operating system.)Option 5: "Interactive" with user to see if the user wants to power off the system.The issue is that the Power Button Event is with the first "Momentary Press" not functioning as expected. As a result, only Option 2: "Power off" the server functions as expected.Attempts to use the "Suspend" or "Hibernate" will cause the operating system to stop responding as the subsequent "Momentary Press" instances of the power button are not processed. In this event, the system must be power-cycled.Attempts to use the "Nothing" or "Interactive" options may cause a system crash due to memory exhaustion caused by the Power Button event Momentary Press not functioning as expected.
Any HPE ProLiant Gen11 RL300 server running Red Hat Enterprise Linux 8.
To avoid this issue, the server can be run in multi-user (i.e., non-graphical) mode as multi-user mode default is to "Power off" upon receipt of a Power Button event. This can be done with the following commands:systemctl set-default multi-user.targetrebootNote (1): The systemd "muliti-user.target" corresponds to the historical Unix/Linux run level 3.Note (2): The systemd "graphical.target" corresponds to the historical Unix/Linux run level 5.In multi-user target, the default action in response to a Power Button Event can be configured by modifying /etc/systemd/logind.conf.In graphical.target, the gnome GUI application "Settings" -> Power, can be used for configuring the action taken in response to Power Button Events when the system is in the graphical target. It should be noted that setting to "Power off" in this tool actually configures "Interactive" and not "Power off."
Operating Systems Affected:Red Hat Enterprise Linux 8 Server
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