Hello, and welcome!
This is conjecture, only: I know that pirofti@ was recently looking at ACPI EC events and their effect on suspend / resume. His
two patches didn't work for me, and he mentioned in Email response to my results over the last weekend that he was planning to work up vendor specific code for this. Perhaps that code has been worked up? There's nothing in sys/dev/acpi/acpiec.c that's been committed, but there is sometimes uncommitted code deployed in snapshots prior to commit.
Whether your suspend/resume issue is related to Paul's development activity or not, I recommend you report your experience to misc@ or bugs@. You're running a very recent -current.
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Strangely, suspend was working flawlessly for quite some time, so perhaps a recent change has provoked this.
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If you know the date of your last -current system, that may help narrow down the cause of the regression.