Catched a dmesg before the flickering:

[   23.332952] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR*
CPU pipe A FIFO underrun


** Attachment added: "dmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1838644/+attachment/5280354/+files/dmesg.txt

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https://bugs.launchpad.net/bugs/1838644

Title:
  Booting into desktop results in flickering

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