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

["Bartek Krawczyk via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR kern/59922; it has been noted by GNATS.

From: Bartek Krawczyk <bartek.krawczyk%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/59922: iwm0 - Intel Dual Band Wireless AC 8265 (rev. 0x78) -
 stopped working on NetBSD 11.0_BETA
Date: Thu, 15 Jan 2026 18:58:01 +0100

 On 1/15/26 11:10 AM, Michael van Elst via gnats wrote:
 >   
 >   There is hardly any difference between netbsd-10 and netbsd-11
 >   regarding the iwm driver and it is known to be pretty flaky.
 >   
 >   One possible difference is the interaction with dhcpcd. It's
 >   possible that without dhcpcd the interface associates to the network,
 >   and when you start dhcpcd aftwards, that it appears to function.
 >   At least that's one of the failure modes I've seen.
 
 I now disabled dhcpcd on boot, rebooted, and without dhcpcd it's also 
 not working with errors about loading firmware. I remember after my 
 sysupgrade from 10.1 t 11_BETA I did compare hashes of the firmware 
 between both versions and these were identical back then. This seems 
 like a regression? I did a full clean install yesterday.
 
 [     1.027605] iwm0 at pci3 dev 0 function 0: Intel Dual Band Wireless 
 AC 8265 (rev. 0x78)
 [     1.027605] iwm0: interrupting at msi1 vec 0
 [     5.468614] iwm0: hw rev 0x230, fw ver 22.361476.0, address 
 40:74:e0:51:38:58
 [    18.748664] iwm0: autoconfiguration error: fatal firmware error
 [    19.738678] iwm0: autoconfiguration error: could not load firmware 
 (error 35, ok 1)
 [    19.738678] iwm0: autoconfiguration error: cpu1 status: 0xa5a5a5a0
 [    19.738678] iwm0: autoconfiguration error: cpu2 status: 0xa5a5a5a0
 [    19.738678] iwm0: autoconfiguration error: could not load firmware 
 (error 35)
 [    23.748724] iwm0: autoconfiguration error: could not load firmware 
 (error 35)
 [    42.298930] iwm0: autoconfiguration error: could not init bt coex 
 (error 35)
 [    42.368931] iwm0: autoconfiguration error: could not init bt coex 
 (error 35)
 
 
 >   In netbsd-current I have tried to fix iwm and it now seems to be
 >   stable for me and some others.
 >   
 >   You could try to boot a current kernel from the daily build
 >   (you may need to also install the modules set from current).
 >   
 >   Or if you are experienced, you could build a netbsd-11 kernel with
 >   the updated driver from netbsd-current.
 
 Thx for a hint, I'll try this.
 
 Regards,
 Bart