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 M.2 wifi compatibility 
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Joined: Wed Feb 20, 2019 6:22 pm
Posts: 4
Post M.2 wifi compatibility
Hey fit-iot,

I'm experiencing an issue with my fitlet 2. I have a known working fitlet2 and fc-pci card populated with an intel 8265 wifi card. I have removed the 8265 and tried using a 9260 (tested working in another machine) and only the bluetooth component populates, no output is provided from lspci or dmesg to indicate that a wifi component is even plugged in. I'm running kernel version 4.20.8 and have the 9260 driver installed, but I would not expect those to have any bearing on the card being detected as installed. Is there a compatibility issue here?



Wed Feb 20, 2019 6:30 pm
Site Admin

Joined: Mon Dec 25, 2017 4:21 pm
Posts: 386
Post Re: M.2 wifi compatibility
We haven't tested the Intel 9260AC, but we have heard from customers that the following might work:

The cause of this issue is probably due to the inability to choose the right PCI interface speed
• PCI setting for Gen2 and De-emphasis in BIOS

Some platforms experience difficulties enumerating the Wi-Fi device after warm boot. The cause of this issue is the ability to choose the right PCI interface speed (Gen1/2). A fix for this issue is to disable the PCI De-emphasis option in the BIOS and set speed to Gen2.

1. De-emphasis disabled.
2. Speed – AUTO (to allow Gen2 speed).

Thu Feb 21, 2019 3:44 pm

Joined: Wed Jun 26, 2019 4:50 pm
Posts: 4
Post Re: M.2 wifi compatibility
Thank you tamir! I can confirm in my fitlet2 CE3930 that disabling the de-emphasis option of the BIOS has allowed my Intel 9260AC wifi/BT module to properly initialize during boot, whereas only BT would work properly before the change. I found the setting(s) buried in the BIOS under Chipset>South Cluster Configuration>PCI Express Configuration>PCI Express Root Port 3>PCIe Selectable De-emphasis>Disable in order to get the wifi to properly initialize under Ubuntu 18.04.1 LTS which apparently is running a kernel with the proper iwlwifi drivers from Intel to work with the Intel 9XXX wifi/BT modules.

The speed was already set to Auto in my case so I did not need to make any changes there. I confirmed that PCI Express Root Port 3 was the only one that needed to have the de-emphasis setting changed in my case with the Intel wifi module installed in the FC CEM fitlet card in the M.2 E key socket as recommended by the installation instructions: ... structions

Hope this will help someone else looking to integrate one of the newer Intel wifi/BT modules in a fitlet2.

Now I just wait for BlueZ to add better support for Bluetooth 5 features like LE coded PHY and I'll be in great shape!


Mon Jul 01, 2019 5:23 pm
Site Admin

Joined: Mon Dec 25, 2017 4:21 pm
Posts: 386
Post Re: M.2 wifi compatibility
Good news, glad this worked out well for you.

Sun Jul 14, 2019 10:39 am
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