Curvy Android

Setting pcie_aspm=off makes the drive work in the top slot albeit one order of magnitude slower than in the bottom slot.
If I swap the kernel parameter with pcie_aspm.policy=performance, I've got a working drive and it's operating at normal speed. Thanks a bunch!
 
Seeing that there are differences in behavior between the two M.2 slots, does that mean they're connected differently?
 

Schematics-wise no - at leasts I don't see a diff in the RV2_SCH.pdf. Electrical-wise probably - other traces, so maybe more or less crosstalk, better or worse gnd and such. From a software perspective: this is PCIE-B and C (while A is unused).
That PCIe active state power management seems to be a source of endless pleasure, maybe the NVME vendors all have digested the wrong specs or so. Anyhow: if it works now, it's fine probably.