I have two Lenovo T420s (details below). Both are set up very similarily. Both have whitelisted BIOS and I installed the Intel AC7260 + bluetooth Wifi cards. One that had a stock BT worked flawlessly after I installed the AC 7260 card...no issues (I disabled the stock BT adapter and only have the AC7260 BT enabled).
The one without stock BT had issues and I finally stumbled by accident the Pin 51 tape trick. Now everything works flawlessly after taping PIN 51 on the card.
Card I am using in both T420s: Intel Dual Band Wireless-AC 7260 2x2 Network plus Bluetooth adapter (7260.HMWWB.R)
PIN 51 tape solution I stumbled upon: https://www.youtube.com/watch?v=F_OWzdeNmD8
1. Lenovo T420s i5 <- this T420s worked right after installing the AC7260 wifi + BT card
Came with stock Bluetooth (I can tell as the BT indicator lights up on the screen bezel)
Disabled the stock BT and everything works well.
2. Lenovo T420s i7 <- this is the T420s that BT didn't work after installing the AC7260 wifi card until I taped PIN 51
Did not come with Bluetooth (no BT indicator light on screen bezel)
I did install the latest Intel Pro Wireless software package as well as the Intel BT software - but still no dice on T420s #2 - I originally saw the BT in Device Manager but it disappeared after...
P.S. Forgot to add that both have Bluetooth enabled in BIOS (i.e. Security - IO Port Access)
Weird....both had the same whitelist bios loaded but I couldn't get BT working without taping PIN 51 on the other one.
Whelp, it is working now and will leave it...chalk it up to a mystery...lol
Thx for the help!
edit: Nevermind, it was the pin 51 tape that had come loose... All good now as usual. Perhaps the pin 51 was just broken on the other T420 / AC7260?
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The bluetooth daughtercard in my T420s is no longer working and I've already tried putting in a new daughtercard with no luck and also already have an mSATA drive in my WWAN slot, so getting bluetooth working on a combo card in the WLAN slot seems to be my next choice.
The thing is, I thought I understood that the half-size WLAN slot on these machines was PCIe-only and doesn't even carry the USB connections needed for the bluetooth part of a wifi+bluetooth combo adapter. Am I just wrong? I've never tested a combo adapter myself, but I have tested other USB mPCIe devices in that slot and they did not work. These were a microSD card reader and a mPCIe form factor USB wifi card from Realtek, both of which I have tested in other mPCIe slots that do have the USB lines (including my T420s' WWAN slot), so I know they are not broken.
Do all USB devices in this slot need to have pin 51 taped even if they don't have a bluetooth radio? Or is there actually some kind of variation in the USB connection on this slot?
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