On Tue, 20 Nov 2018, David H. Gutteridge wrote:
FWIW, I'm able to get suspend and resume to work reliably on a Lenovo T420 with NetBSD-8.0_STABLE. (With 8.99.x, it doesn't work as reliably because the SATA driver seems to have issues after resumption which don't occur with 8.0.)
Jaromir Dolocek did a lot of work on ahcisata recently. You might try to coordninate with him to see if his changes have affected the suspend and resume stuff.
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