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/wakeupDevice  S-state   Status   Sysfs nodeLID   S4    *enabled   platform:PNP0C0D:00SLPB      S3    *enabled   platform:PNP0C0E:00IGBE      S4    *enabled   pci:0000:00:19.0EXP3      S4    *disabled  pci:0000:00:1c.2XHCI      S3    *enabled   pci:0000:00:14.0EHC1      S3    *enabled   pci:0000:00:1d.0EHC2      S3    *enabled   pci:0000:00:1a.0HDEF      S4    *disabled  pci:0000:00:1b.0I have documented some findings as an answer below. Seems that now only IGBE and HDEF are lacking from the picture.
Understanding ACPI wake-up codes / DSDT (Differentiated System Description Table) of Thinkpad T430s BIOS
acpi;bios;thinkpad;sleep;dsdt