M.2 A+E card isn't showing up, yet Wi-Fi and Bluetooth work fine.
M.2 A+E card isn't showing up, yet Wi-Fi and Bluetooth work fine.
I've now acquired two M.2 A+E microSD card readers (from eBay and Aliexpress; they seem identical using the same USB2.0 to SD adapter chip). Neither device functions in my Lenovo m715q or Jingsha B85M-I systems (no updates in USBTreeView), even though both support the PCIe and USB parts of an A+E Wi-Fi card (Intel AX200). Based on the fact that the board's LED isn't illuminating, I suspect the slot isn't delivering 3.3V ready for a trigger, though the AX200 pinout details are limited (some pins marked as DO NOT CONNECT). I haven't examined the system boards closely to check for power or USB control chips, but that's still possible. Did I accidentally end up with two nonworking adapter boards? (Tomorrow’s plan: test them on my laptop, since it’s the only A+E system left, even though I prefer not to stress it)
To use a relatively slow SD card reader with an M.2 slot, you may intentionally damage the slot to prevent data corruption or performance issues.
A+E slot refers to PCIE1x and USB-only, typically found on wireless cards. I explored this for hypervisor/truenas myself but had nvmes available at the time.
Updated: Tested on my laptop but failed. Noted I have a PCIe x1 carrier board for M.2 A+E, so I attempted that setup. Still no success. It seems the core issue is 3V3 and USB D+/D-, which are standard defaults. If it didn’t work there, the design likely has a problem. Giving up.