On Sat, Sep 26, 2026 at 10:17:30PM -0500, Barrett Ruth wrote: > >Synopsis: iwx(4): device timeouts after firmware response 0x5f4 > >Category: kernel > >Environment: > System : OpenBSD 8.0 > Details : OpenBSD 8.0 (GENERIC.MP) #59: Sat Sep 26 14:49:24 MDT 2026 > [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP > > Architecture: OpenBSD.amd64 > Machine : amd64 > >Description: > iwx0 (Intel Wi-Fi 6 AX201) connects to the access point on > 5 GHz channel 44, mode 11ac. Then I see the below errors. > > Below, the first "unhandled firmware response > 0x5f4/0x2000000c" message occurs 13 minutes after boot, repeating > every ~4s. "iwx0: device timeout" repeats every ~18s. > > Saw the same on 7.9-release. > > Using "mode 11{a,n}" in hostname.iwx0, NO error occurred after > ~1h of use! Without, I see the below timeouts less than a minute after boot. > > The access point is an AT&T BGW320-500 gateway. > > Happy to give more information. This is my first time using OpenBSD, > as you can probably guess. Thanks so much! >
This has something to do with the AP announcing a channel switch, possibly while reducing the channel width from 160 MHz to 80 MHz. Which would explain why you are only seeing this problem in 11ac mode, since 11n runs in 40 or 20 MHz width, and 11a mode only runs in 20 MHz width. We do not handle this firmware notification yet. The Linux driver seems to handle it by disconnecting from the AP and disabling the use of wide channels on reconnect. I don't have time to write a patch right now. Maybe later.
