[Bug 2127100] Re: [SRU] Fix kernel cmdline for Thor systems, drop incorrect chmod, block jammy do-release-upgrade

[Chris Halse Rogers]

So, I've got a few questions here:

1) What, and how are we testing on Jammy? Do we expect Thor platforms to
boot Jammy images with this patch (the test case only tests Noble
images).

2) Changing user configuration in an attempt to disable do-release-
upgrade is not really appropriate, and won't have the result of
disabling do-release-upgrade anyway (users can just change it back). Is
this one of those cases where we have broken Ubuntu policy by accepting
some kernel packages we cannot maintain into the main archive?

3) Are upgrades from *Noble* expected to work? Do we at least have
kernel support for that going forward?

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https://bugs.launchpad.net/bugs/2127100

Title:
  [SRU] Fix kernel cmdline for Thor systems, drop incorrect chmod, block
  jammy do-release-upgrade

Status in nvidia-tegra-defaults package in Ubuntu:
  Fix Released
Status in nvidia-tegra-defaults source package in Jammy:
  Incomplete
Status in nvidia-tegra-defaults source package in Noble:
  Fix Committed
Status in nvidia-tegra-defaults source package in Plucky:
  Fix Committed
Status in nvidia-tegra-defaults source package in Questing:
  Fix Committed

Bug description:
  [ Impact ]

   * The new Thor platform require an additional kernel command line
  parameter to properly function. The nvidia-tegra-defaults is already
  responsible for some specific kernel cmdline setup, adding these here
  will enable this new hardware.

   * While implementing these fixes, we realized a chmod was pushed
  previously in postinst that shouldn't be there.

  [ Test Plan ]

   * Booting a Thor platform without this patch is not possible if there
  is not another workaround implemented. Booting the board with a noble
  image including this package without any manual change of the kernel
  command line must work.

  [ Where problems could occur ]

   * Thor platforms could still not work if these kernel parameters are
  not enough.

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