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This question already has an answer here:

I'd like to trim wakeup events of my laptop. Could someone please explain me these 4 letter codes - which devices do they actually represent?

$ cat /proc/acpi/wakeup
Device  S-state   Status   Sysfs node
LID   S4    *enabled   platform:PNP0C0D:00
SLPB      S3    *enabled   platform:PNP0C0E:00
IGBE      S4    *enabled   pci:0000:00:19.0
EXP3      S4    *disabled  pci:0000:00:1c.2
XHCI      S3    *enabled   pci:0000:00:14.0
EHC1      S3    *enabled   pci:0000:00:1d.0
EHC2      S3    *enabled   pci:0000:00:1a.0
HDEF      S4    *disabled  pci:0000:00:1b.0

I have documented some findings as an answer below. Seems that now only IGBE and HDEF are lacking from the picture.

marked as duplicate by Rui F Ribeiro, Anthon, Thomas Dickey, hildred, Kusalananda Jun 19 '17 at 7:50

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  • Thanks @StephenRauch. I've documented findings and guessing as an answer. Now 2 codes are lacking. Hopefully someone more more experienced knows... – Pawel Debski Jun 18 '17 at 19:49
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Here is partial answer. From the ACPI wakeup 4-letters code meaning? I understand the following:

LID  - laptop lid
EXP3 - PCI Express Root Port nr 3 - could be broadband modem in my case (not sure how to pinpoint if it is actually in slot 3)
XHCI, EHC1, EHC2 - USB controllers

Now guessing:

SLPB - sleep button :-)

and finally what could be IGBE and HDEF?

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