kern/59922: iwm0 - Intel Dual Band Wireless AC 8265 (rev. 0x78) - stopped working on NetBSD 11.0_BETA

["bartek.krawczyk%gmail.com@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         59922
>Category:       kern
>Synopsis:       iwm0 - Intel Dual Band Wireless AC 8265 (rev. 0x78) - stopped working on NetBSD 11.0_BETA
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 15 09:25:00 +0000 2026
>Originator:     Bartlomiej Krawczyk
>Release:        11.0_BETA
>Organization:
>Environment:
NetBSD laptop 11.0_BETA NetBSD 11.0_BETA (GENERIC) #0: Thu Jan  8 10:53:08 UTC 2026  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
After upgrading to 11.0_BETA using sysupgrade my iwm0 interface stopped working. I thought it may be a botched upgrade, so did a clean 11.0_BETA install from latest snapshot on 13th of Jan 2026.
In the installer, I could do "ifconfig iwm0 list scan" and it showed networks so I was hopeful. After finishing the installation though, the iwm0 interface stopped working. It was working correctly (albeit slow) on 10.1 release.

laptop# dmesg | grep iwm0
[     1.026015] iwm0 at pci3 dev 0 function 0: Intel Dual Band Wireless AC 8265 (rev. 0x78)
[     1.026015] iwm0: interrupting at msi1 vec 0
[     6.961864] iwm0: autoconfiguration error: failed to read nvm
[     1.038164] iwm0 at pci3 dev 0 function 0: Intel Dual Band Wireless AC 8265 (rev. 0x78)
[     1.038164] iwm0: interrupting at msi1 vec 0
[     4.271387] iwm0: hw rev 0x230, fw ver 22.361476.0, address 40:74:e0:51:38:58
[    19.361390] iwm0: autoconfiguration error: could not init bt coex (error 35)
[    19.421390] iwm0: autoconfiguration error: could not init bt coex (error 35)
[    30.651456] iwm0: autoconfiguration error: could not init bt coex (error 35)
[    30.721457] iwm0: autoconfiguration error: could not init bt coex (error 35)


laptop# ifconfig iwm0 list scan
ifconfig: SIOCS80211: Invalid argument


laptop# ifconfig iwm0
iwm0: flags=0x8803<UP,BROADCAST,SIMPLEX,MULTICAST> mtu 1500
        ssid "" nwkey 65536:"","","",""
        powersave off
        address: 40:74:e0:51:38:58
        media: IEEE802.11 autoselect
        status: no network
        inet6 fe80::4274:e0ff:fe51:3858%iwm0/64 flags 0x8<DETACHED> scopeid 0x3
        inet 169.254.70.202/16 broadcast 169.254.255.255 flags 0x4<DETACHED>
>How-To-Repeat:
Upgrade to 11.0_BETA from 10.1 on a Lenovo ThinkPad T480 using Intel Dual Band Wireless AC 8265 (rev. 0x78) wireless card
>Fix: