I tried the proposed linux/6.8.0-103.103 kernel. No extra parameters were given 
to kernel:
BOOT_IMAGE=/boot/vmlinuz-6.8.0-103-generic 
root=UUID=c6b19f0f-68ff-4d8c-985a-c3ed88345389 ro quiet splash 
resume=UUID=f25913ea-6478-45dc-8f64-ea5d721a8f25 vt.handoff=7

On both laptops I get following in the log:
kernel: pci 0000:00:02.0: DMAR: Disabling IOMMU for graphics on this chipset

I did not manage to reproduce the flickering on either laptop.

** Tags removed: verification-needed-noble-linux
** Tags added: verification-done-noble-linux

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https://bugs.launchpad.net/bugs/2136958

Title:
  Random flickering with Intel i915 (CoffeeLake and WhiskeyLake) on
  Linux 6.8

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