[Discussion] how to implement external power down for ARM

[Arnd Bergmann]

On Thursday 07 May 2015 17:18:45 Shannon Zhao wrote:
> On 2015/5/7 16:55, Arnd Bergmann wrote:
> > On Thursday 07 May 2015 10:39:35 Shannon Zhao wrote:
> >> I tried Ubuntu Trusty from Christoffer, when typing "system_powerdown"
> >> on QEMU monitor, "cat /dev/input/event0 | hexdump" shows the event is
> >> triggered but the guest doesn't poweroff.
> > 
> > Can you try installing acpid by running 'sudo apt-get install acpid' in
> > the image? I suspect it should just work by scanning the event devices
> > even in the absence of ACPI on the platform.
> > 
> 
> Cool, I start acpid and the poweroff works.

Ok, great, thanks for confirming this! Have you tried reboot as well?

>From looking at the acpid source code, I suspect it does not work unless
extra configuration files are added, but that would be the same as for the
ACPI case.

	Arnd