linux-kernel - PROBLEM: Linux 5.5 fails to load firmware for Intel(R) Dual Band Wireless AC 3168

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Message-ID: <20200208010903.GA1366@chirva-slack.chirva-slack>
Date:   Fri, 7 Feb 2020 20:09:03 -0500
From:   Stuart Little <achirvasub@...il.com>
To:     Johannes Berg <johannes.berg@...el.com>,
        emmanuel.grumbach@...el.com, Luca Coelho <luciano.coelho@...el.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>, linuxwifi@...el.com,
        linux-wireless@...r.kernel.org
Subject: PROBLEM: Linux 5.5 fails to load firmware for Intel(R) Dual Band
 Wireless AC 3168

I am on an

Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz

with an Intel wifi card:

Intel(R) Dual Band Wireless AC 3168, REV=0x220

The machine is running Slackware 14.2 with a custom-compiled 5.5 kernel (from source; commit d5226fa6dbae Linux 5.5).

The issue:

Booting into that kernel results in failure to load the wifi card firmware. The relevant dmesg portion is attached (these are all of the lines containing 'iwlwifi'). 

I have checked that it breaks between

def9d2780727 Linux 5.5-rc7 (good)

and

d5226fa6dbae Linux 5.5 (bad)

I will attempt a bisect to track down the precise faulty commit, but this is all I have for now. Please let me know if I can provide more info short of the bisect.

P.S.

I have checked that the very latest commit at the time of this writing (41dcd67e88688afbeb3b2bd23960eed5daec74e7 at Fri Feb 7 20:07:29 EST 2020) is still broken on this machine.

View attachment "dmesg_iwlwifi_snippet" of type "text/plain" (5060 bytes)