Re: Debugging spurious wakeup

[Daniel Lezcano <daniel.lezcano@linaro.org>]

Hi Gianluca,

do yo have the option "Remain off after power failure" in the BIOS ?

Does the issue occur if you set this option ?




On 05/13/2015 08:58 AM, Gianluca Anzolin wrote:
> Hello,
>
> I have a curious problem with my system: whenever I wake up the PC with a WOL
> magic packet and then power it off the systems comes back to life after a
> couple of seconds, by itself.
>
> I can reproduce the problem 100% of the times.
>
> I've been having this problems for years. I remember this same issue occurred
> also with my previous computer, with a different mainboard. My current system
> has an ASUS P8B-WS mb with a Xeon 1275v2 CPU.
>
> I've ruled out in the time many factors: traffic on the net (by disconnecting
> the cable), RTC alarms (by disabling them)... long story short: I'm stuck.
>
> While I'm not the only one with this issue (see[1]), some people have reported
> mixed success by blacklisting some components (xhci-pci) or by setting
> unrelated BIOS options. Unfortunately these workarounds never worked for me.
>
> So I'm here to ask if there is a way to get the source/cause of the last wakeup
> by setting some ACPI debug option. This way I could at least pinpoint the
> device/interface that caused the spontaneous wakeup and then debug further or
> at least disable it.
>
> I've tried to enable the ACPI hardware-related messages with the kernel
> arguments: acpi.debug_layer=0x2 acpi.debug_level=0xffffffff
>
> Unfortunately I can't see the information I'm looking for in the resulting
> output. Should I enable some other debug_layer? Could anybody point me in the
> right direction?
>
> Thank you and best regards,
>
> Gianluca
>
> [1] https://bbs.archlinux.org/viewtopic.php?id=173648
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