Hi Kelvin,
Unfortunately this has still not been fixed in a kernel release. The test 
kernel that I had prepared in order to verify whether my suspicion with regards 
to the root cause of this problem is correct simply reverted a change that was 
made for this bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1965303
The cause of this issue seems to be indeed the switch to simpledrm, however, 
reverting these changes is not really feasible since the fbdev interface has 
been deprecated and switching back to it seems hard to justify for an SRU. I am 
currently investigating whether this can be solved in a different way, other 
than reverting to the old mechanism. I will try to provide an update as soon as 
possible, sorry for the delay.

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https://bugs.launchpad.net/bugs/2061373

Title:
  [Lenovo Ubuntu 24.04 Bug] Print grub message before the uefi POST
  screen disappears in Ubuntu24.04 Beta

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