5.13.0-21 breaks wifi ath11k / mhi

[stelian]

Booting to the latest ubuntu kernel, ath11k based wifi does not work anymore.

The bug is well described and patched upstream, see : https://bugzilla.kernel.org/show_bug.cgi?id=214455

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-20-generic 5.13.0-20.20
ProcVersionSignature: Ubuntu 5.13.0-20.20-generic 5.13.14
Uname: Linux 5.13.0-20-generic x86_64
ApportVersion: 2.20.11-0ubuntu71
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: stelian 5572 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 12 10:55:01 2021
InstallationDate: Installed on 2021-02-16 (268 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
MachineType: Dell Inc. XPS 13 9310
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.13.0-20-generic root=/dev/mapper/system-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-20-generic N/A
 linux-backports-modules-5.13.0-20-generic N/A
 linux-firmware 1.201.1
SourcePackage: linux
UpgradeStatus: Upgraded to impish on 2021-10-16 (26 days ago)
dmi.bios.date: 07/16/2021
dmi.bios.release: 3.0
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 3.0.4
dmi.board.name: 0MRT12
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr3.0.4:bd07/16/2021:br3.0:svnDellInc.:pnXPS139310:pvr:sku0991:rvnDellInc.:rn0MRT12:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9310
dmi.product.sku: 0991
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[stelian (stelian)]

Previous kernel (5.13.0-20) works fine, as you can see from the above dmesg/iwconfig etc.

[Kenneth Rawlings (rawlink)]

Will use previous kernel as @stelian suggests. Had to use a usb ethernet adapter to find this.
Also have an XPS 9310 like stelian so logs/dumps from me would just be a repeat.

[Kenneth Rawlings (rawlink)]

Just a quick note for others. I had to fully turn off my laptop before booting to 5.13.0-20 for things to work. From something said in the upstream bug, sounds like the hardware may get into a weird state from booting 5.13.0-21 that can't be remedied by a warm reboot.