[Bug 2051457] Re: Jammy 22.04.3 gcc compiler no longer builds modules for 6.5.0 kernel series

[Mike Ferreira]

I see this going forward, just getting further from this unless
something changes to adapt. Usually an LTS stays within a narrow range
of kernel series. This has sandbox changed.

So if LTS no longer supports building working modules for the hardware
stack that is the default installed with Desktop Edition, and the hinted
plan is to extend 22.04 to 12 years, like 24.04, then you will just let
it fail and dead-end within that LTS period?

Is that the official stance now? Just asking.

Maybe the HWE Stack should include a framework convention to support
this?

Or is the quote from Canonical (quoted above) on making nvidia dkms
work, going to try to go about that via another path?

If you know of another way, please share that wisdom. It doesn't help
anyone to keep a different/smarter way to solve that a secret. Does it?

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https://bugs.launchpad.net/bugs/2051457

Title:
  Jammy 22.04.3 gcc compiler no longer builds modules for  6.5.0 kernel
  series

Status in gcc-defaults package in Ubuntu:
  Won't Fix

Bug description:
  Since Jammy went to the 6.5.0 kernel series, that kernel series was
  compiled with gcc-12. The previous 6.2.0 series kernels were compiled
  with gcc-11.

  The current version of gcc in jammy is 11.4.

  Many NVidia drivers, wifi drivers, VirtualBox (from our Repo), etc
  fail to build the modules, because of a gcc compiler version mismatch
  between what the current running kernel was built by, and the module
  being built.

  I recognized this while helping Users with NVidia driver compile errors on the forum, and came up with this work-around for them:
  https://ubuntuforums.org/showthread.php?t=2494273&p=14175164#post14175164

  Summary:
  Install gcc-12 & g++-12 on 22.04.3 and use it as the compiler.

  Since then, this work-around has helped to resolve problems with
  running the 6.5.0 series kernels and building modules for other
  applications and hardware drivers: VirtualBox, WiFi Drivers, etc. for
  use with the 6.5.0 series.

  I have run this for over a month as my default with no ill affects. I
  have continued to recommend this work-around to many user to solve
  their problems...

  *** I think it is time to look at pushing through gcc-12 as the
  default compiler for 22.04.3 through the normal updates channel.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: gcc 4:11.2.0-1ubuntu1
  ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3
  Uname: Linux 6.5.0-14-generic x86_64
  NonfreeKernelModules: zfs nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CloudArchitecture: x86_64
  CloudID: none
  CloudName: none
  CloudPlatform: none
  CloudSubPlatform: config
  CurrentDesktop: GNOME
  Date: Sun Jan 28 08:23:37 2024
  InstallationDate: Installed on 2022-09-19 (496 days ago)
  InstallationMedia: Ubuntu-Server 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809)
  SourcePackage: gcc-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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