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Date: Sat, 20 Apr 2024 09:44:00 +0200
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From: Stefan Seyfried <stefan.seyfried@googlemail.com>
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To: linux-wireless@vger.kernel.org
Subject: 6.9 iwlwifi regression: Thinkpad 480 no Wifi
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Hello,

I'm running a Thinkpad T480, lspci reports
03:00.0 0280: 8086:24fd (rev 78)
Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
Subsystem: Intel Corporation Dual Band Wireless-AC 8265 [Windstorm Peak]

Using 6.8 kernels, everything is fine (the first kernel I ever used on 
this machine was 6.8.1 from openSUSE Tumbleweed).

Since 6.9-rc1 (using precompiled SUSE Kernel-of-the-day), wireless just 
does not work.

Nothing suspicious in dmesg, NetworkManager does nothing and a manual

mixi:~ # ip link set up dev wlp3s0
RTNETLINK answers: Invalid argument

The only thing I could think of was rfkill, but it looks good to me:
mixi:~ # rfkill
ID TYPE      DEVICE                   SOFT      HARD
  0 bluetooth tpacpi_bluetooth_sw   blocked unblocked
  1 wlan      phy0                unblocked unblocked

Rebooting into 6.8 makes everything work again.
I have absolutely no idea where to start debugging :-)

These are all the releated dmesg entries I could find (from 6.8, but 
there is no difference to 6.9-rc4):
iwlwifi 0000:03:00.0: Detected crf-id 0xbadcafe, cnv-id 0x10 wfpm id 
0x80000000
iwlwifi 0000:03:00.0: PCI dev 24fd/0010, rev=0x230, rfid=0xd55555d5
iwlwifi 0000:03:00.0: loaded firmware version 36.ca7b901d.0 
8265-36.ucode op_mode iwlmvm
iwlwifi 0000:03:00.0: Detected Intel(R) Dual Band Wireless AC 8265, 
REV=0x230
iwlwifi 0000:03:00.0: base HW address: 38:ba:f8:f4:ed:63, OTP minor 
version: 0x4
ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0
iwlwifi 0000:03:00.0: Registered PHC clock: iwlwifi-PTP, with index: 1

Best regards,
Stefan
-- 
Stefan Seyfried

"For a successful technology, reality must take precedence over
  public relations, for nature cannot be fooled." -- Richard Feynman