[iwlwifi] Repeated kernel crashes in iwl_mvm_async_handlers_wk cause GUI stuttering in kernel 5.3 (but 5.0 has no problem)

[Etamuk]

After upgrading to Ubuntu 19.10 from 19.04 I noticed the mouse moves unequally/choppy. I did a fresh install (deleting and overwriting 19.04 with 19.10).
For example: When I want to go to a button the cursor sometimes stops on the way to it and moves on milliseconds later.
In Ubuntu Ubuntu 19.04 (which is my daily driver for now) this behavior is not present.

Please let me now if I can add some further information.

lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10

All available system updates were installed. No extensions added additionally.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-shell 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Oct 26 06:23:01 2019
DisplayManager: gdm3
InstallationDate: Installed on 2019-10-20 (5 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.34.1-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Please run these commands:

  lspci -k > lspcik.txt
  dmesg > dmesg.txt

and then attach the two files that were created.

[Etamuk (trmfach)]

Thank you for your quick answer.
Here are the two files:

[Etamuk (trmfach)]

File two (cannot upload 2 file the same time?...)

[Daniel van Vugt (vanvugt)]

Thanks. The kernel log (dmesg.txt) shows some recurring problem with the Intel wifi driver that takes half a second or so each time. That might be the problem if it's holding up the whole kernel...

Please try:

 * Turning off wifi; or

 * Monitoring the kernel log in a Terminal window:

   dmesg -w

   to see if the kernel errors match up with the mouse movement problem.

[Etamuk (trmfach)]

Thank you again.
I am not using WLAN (using network cable) so I switched off WLAN in Settings.
Now the problem is gone. The mouse moves as expected. Very nice.
I also tried to monitoring the kernel log. But I cannot understand it, because I am simply a user :-)

Do you need the output? With or without WLAN ON/OFF?

I noticed the WiFi card is not working, as you can see on the screenshot.

I am really appreciated for your help!

Please let me know if you need more files to solve this problem finally. Maybe there are a lot of users with a similar computer hardware combination and which are using WLAN.

[Etamuk (trmfach)]

Today I noticed when I start my system with the other kernel 5.0.0-32-generic #34-Ubuntu there are no problem regarding the mouse movement (WiFi was activated)

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

This change was made by a bot.

[Axel Meunier (axel-meunier)]

I'm affected by what seems to be the same bug or a very similar one.
Also Ubuntu 19.10 fresh install.
Additional information from what I have observed on my machine :
- It's not only the cursor that stutters but the whole machine freezes for an instant. It's most noticeable while scrolling or watching videos.
- it does not start right away. Maybe after suspend ? I'm not yet sure.
- I have the same information re the Inter wireless 8260 driver than mentioned by the other user (namely that it does not function).
- On the other hand, I have tried disabling Wifi but it did not seem to have any effect (I will check again).
Here are the dmesg and lpsci text files.
Thanks for your help.

[Axel Meunier (axel-meunier)]

And the dmesg.

[Axel Meunier (axel-meunier)]

Additional dmesg output, right after the problem appears for the first time (sometime after booting, definitely not related to suspend as I supposed in my first message).

[Etamuk (trmfach)]

Hello,
today there were two kernel updates announced by the app Software.
So I run this update (one update was in the afternoon, the other in the evening.

After the second update I remembered the problem descripted in the top of this thread.
So I switched on WLAN and noticed the problem seems to be gone.
No problem with the cursor anymore on my system.

$ uname -a
Linux xxxxxxx 5.3.0-23-generic #25-Ubuntu SMP Tue Nov 12 09:22:33 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Thank you.