gpio-poweroff dt overlay also switches pin when "halt --halt" is executed #1600
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The reference to "reboot" in the README is sloppy use of language - we'll correct it. The standard halt behaviour on 32-bit ARMs is to disable interrupts and leave the CPUs spinning. The RPi branches have a patch (3ce05d6) that makes halt equivalent to poweroff. This was to reduce power consumption and heat in what should be a low-power mode, so the change was intentional. If you can explain why would you want to halt without powering off then we can consider whether it is worth reinvestigating. |
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Thank you for reading my issue! For me it is no real problem, i just thought that this information might be useful to this project. I dunno. |
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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OK, for now I will say "This behaviour is by design" (at least for RPi kernels). I've added a note to the README to this effect. If this proves to be a problem for users then we can revisit the issue. |
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: #1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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1) GPIO pin is signalled on poweroff, not reboot. 2) In RPi kernels, halt is equivalent to poweroff. See: raspberrypi/linux#1600
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In #1031 an optional feature (
gpio-poweroffdevice tree overlay) was introduced to mimic the poweroff behaviour of standard desktop computers: If the system is being powered off, also the power supply will be "detached" - the LEDs are off. This is like making an ACPI call to the power supply unit.So first of all, in the documentation of gpio-poweroff (overlays README file) it is written:
This is clearly not correct, because this feature only activates on poweroff (not reboot), right?
And now for the real issue: The feature also activates on halt - eg. only the software is completely stopped, but the hardware still has power. Test it yourself with
shutdown --halt noworhalt --haltorsystemctl halt.Is this maybe intended?
I searched for similar issues and only found the citation of this bugfix, but i am not sure if this is related.
Maybe i am just understanding the behaviour of "halting a system" differently here, if so please tell me too.
Thanks a lot in advantage!
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