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

[Pierre Ducroquet]

Testing done on questing with the package version 1.6ubuntu0.1 : 
- create a fresh questing chroot using debootstrap
- install a generic kernel (we don't have any Tegra Thor kernel available for questing yet)
- install the nvidia-tegra-defaults package from the ubuntu-proposed suite
- check that the generated grub.cfg file has the required parameters for Thor

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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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