IRQ conflict between Ethernet and USB with linux 5.4.0-56-lowlatency kernel

[Oliver K.]

Package: linux-image-5.4.0.56.lowlatency / Focal Ubuntu Studio 20.04

WLan is working PCI Ethernet not.

[ 11.223573] genirq: Flags mismatch irq 18. 00010080 (enp3s1) vs. 00002080 (uhci_hcd:usb4)
[ 11.299519] genirq: Flags mismatch irq 16. 00010080 (ens32) vs. 00002080 (uhci_hcd:usb5)

Maybe this report can helpfull for bug 1906655. sounds similar for other kernel.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC2: oliver 2033 F.... pulseaudio
 /dev/snd/controlC0: oliver 2033 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-01 (247 days ago)
InstallationMedia: Ubuntu-Studio 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: ECS G31T-M7
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-lowlatency root=UUID=d918f4d9-9814-4dbd-a547-02a0ddc59f12 ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 5.4.0-56.62-lowlatency 5.4.73
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-56-lowlatency N/A
 linux-backports-modules-5.4.0-56-lowlatency N/A
 linux-firmware 1.187.4
RfKill:

StagingDrivers: r8712u
Tags: focal staging
Uname: Linux 5.4.0-56-lowlatency x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm audio cdrom dialout dip lp lpadmin plugdev sambashare saned scanner sudo video
_MarkForUpload: True
dmi.bios.date: 03/01/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080014
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: G31T-M7
dmi.board.vendor: ECS
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: ECS
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080014:bd03/01/2010:svnECS:pnG31T-M7:pvr1.0:rvnECS:rnG31T-M7:rvr1.0:cvnECS:ct3:cvr1.0:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: G31T-M7
dmi.product.sku: To Be Filled By O.E.M.
dmi.product.version: 1.0
dmi.sys.vendor: ECS

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

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1906913

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Oliver K. (big-ghost-ok)]

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[Erich Eickmeyer (eeickmeyer)]

As this issue is not specific to Ubuntu Studio, and since this has *not* been verified by anybody but the bug reporter, I removed Ubuntu Studio Developers from this bug and changed it to "New".

The lowlatency kernel has many, many more use cases than audio, hence it is no longer developed or managed by the Ubuntu Studio team. This is an Ubuntu kernel issue completely, and in no way should the Ubuntu Studio Development team be involved here as that is too much workload on an already strained and low-numbered team.

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

This change was made by a bot.

[Oliver K. (big-ghost-ok)]

It's not just me who reported this. Is also in askubuntu:

https://askubuntu.com/questions/1296943/irq-conflict-between-ethernet-port-and-usb-2-controller-with-linux-5-4-0-56-lowl

Because that has nothing to do with Ubuntu Studio alone. I reported it here under linux (ubuntu).

For the “Ubuntu Kernel Team” a short question?

https://wiki.ubuntu.com/KernelTeam refers to:

The Ubuntu Kernel Team is in Launchpad as:

    https://launchpad.net/~ubuntu-kernel-team this is the moderated public team in which we interact with the Ubuntu Community.

Why is it not possible to report a bug directly to the "Ubuntu Kernel Team". Even if that's such an old page. why is this not deleted?

[Ross Gammon (rosco2)]

I have not looked into the reason what happened in 5.4.0-56-lowlatency kernel to cause the problem, but I can confirm that installing version 5.4.0-57.63 from focal-proposed fixes the problem.

I have my network back! I am yet to test my USB audio card.

[Ross Gammon (rosco2)]

And the USB audio device works as well with 5.4.0-57.63 . Marking the bug as "Fix Released". When this kernel migrates from proposed into the updates pocket, the bug will be fixed.

It will be necessary to select the 5.4.0-54-lowlatency in the Grub menu in order to have the internet to be able to update to 5.4.0-57.63.

[Erich Eickmeyer (eeickmeyer)]

> Why is it not possible to report a bug directly to the "Ubuntu Kernel Team"?

Because this way (reporting it against the package) DOES report it to the correct team. Ubuntu does stuff automatically so you don't have to. :)

[Andy Whitcroft (apw)]

@big-ghost-ok could you check out the -57 kernel in -proposed and see if it does fix your issue too?

[Oliver K. (big-ghost-ok)]

I tested the proposed kernel (-57.63) on two systems for a whole day.
The problem was solved with the proposed kernel on this machine.

By the way. It also solves a USB problem on my main machine.
All USB ports have dropped out sporadically there with (-56.62).
Until a restart. The only way to revive the computer was to turn the power off.
As a side effect. I now have a SMART error on a new 3TB WD RED hard drive.

Note on the edge:
This is what happens when something doesn't work or when it is released
without actually testing it. Testing needs time!

Otherwise it works now. Thank you.

I also tested the Arturia AudioFuse USB on both machines. Works perfectly.

[Oliver K. (big-ghost-ok)]

Kernel "linux-image-5.4.0-58-lowlatency" (5.4.0-58.64) (focal-updates) has the same error again!

[Oliver K. (big-ghost-ok)]

For a short working replacement at the moment. I am now using the "linux-image-5.4.0-58-generic". Without any problems.

[Ross Gammon (rosco2)]

Reopening this as the latest update to linux-image-5.4.0.58.lowlatency reintroduces this bug. Starting the linux-image-5.4.0.57.lowlatency kernel from grub gets around the issue.

[Ross Gammon (rosco2)]

There is a new version 5.4.0-59.65 on -proposed that could be tested. Bit busy at the moment.