[coreboot - Bug #548] Lenovo X201 Fails To Recognize Upgraded WiFi Card

Issue #548 has been updated by Walter Sonius.


This ticket may be closed / set to resolved. This `Intel Corporation Dual Band Wireless-AC 7260` wifi card seated in the WLAN slot has been working and tested on my x201 for the past 3 years (early days with SeaBios).

Verified this recently since `RESOURCE_ALLOCATION_TOP_DOWN` became enabled again by default on Coreboot 25.03-467-gf0ad05b57ebe 05/14/2025 with MrChromebox 2502 edk2 fork on this x201. 

However in case of also enabling `Above 4G decode` it will not load a wireless driver and won't show the wlan slot in `rfkill` it will only list the device-id in lspci. Also libgfxinit bootscreen stays black both for laptop and VGA & Display-port(dock) when enabling this `Above 4G decode` but as soon as the OS loads the GPU driver screen comes back again. Since this above 4g decode is not a default option, it was also not enabled by the topic starter looking at his config it might have been a different bug at that time that messed up the pcie identification? 

Don't forget to also remove this from the coreboot changelog/release notes as well.


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Bug #548: Lenovo X201 Fails To Recognize Upgraded WiFi Card
https://ticket.coreboot.org/issues/548#change-2098

* Author: Jeremy Brown
* Status: New
* Priority: Normal
* Target version: none
* Start date: 2024-07-15
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I am running coreboot 24.05 on my Lenovo X201.

I decided to upgrade my WiFi card from an Intel Centrino Advanced-N 6205 to an Intel Wireless-AC 7260; since I selected the option to support Intel PCIe cards in my build config I expected everything to work but my computer fails to recognize the new card. The old card is still recognized if I reinstall it so I know I didn't mess up the socket somehow; I've read reports of the 7260 [working with a modded factory BIOS](https://richbits.rbarnes.org/installing-the-intel-7260-in-the-thinkpad-x201.html) so I don't think there's an electrical issue. I've seen [somewhat related bugs](https://ticket.coreboot.org/issues/311) but it seems their issue isn't mine.

I've attached lspci data from both chips and my build config, lmk if additional information is needed.

---Files--------------------------------
6205_lspci_tree.txt (1.63 KB)
7260_lspci_tree.txt (1.57 KB)
6205_lspci.txt (12.8 KB)
7260_lspci.txt (12.2 KB)
coreboot.cfg (20.1 KB)
6205_root_inspection.txt (3.58 KB)
7260_root_inspection.txt (3.58 KB)
6205_cbmem_dump.txt (43.2 KB)
7260_cbmem_dump.txt (42.1 KB)
x201-gfxinit-ed2k-2408-config (10.5 KB)


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