This seems to be a testbed issue and not a linux-raspi kernel bug.

Looking at the logs, the first reboot with the latest raspi kernel
installed is successful. However, some subsequent reboot will fail.
Looking at the openstack nova console logs, we can see that the testbed
is running the generic arm64 kernel:

------- nova console-log 225fbcdf-170f-4f77-bf46-1435821e0776 
(adt-hirsute-arm64-systemd-20210528-035426) ------
[2J[01;01H[=3h[2J[01;01H[2J[01;01H[=3h[2J[01;01H[2J[01;01H[=3h[2J[01;01H[0m[35m[40m[0m[37m[40merror:
 no suitable video mode found.
EFI stub: Booting Linux Kernel...
EFI stub: EFI_RNG_PROTOCOL unavailable, KASLR will be disabled
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x503f0002]
[    0.000000] Linux version 5.11.0-17-generic (buildd@bos02-arm64-057) (gcc 
(Ubuntu 10.3.0-1ubuntu1) 10.3.0, GNU ld (GNU Binutils for Ubuntu) 2.36.1) 
#18-Ubuntu SMP Thu May 6 17:29:33 UTC 2021 (Ubuntu 5.11.0-17.18-generic 5.11.12)

When the system is rebooted, it fails to come back and hangs at:

[  145.624340] reboot: Restarting system
[2J[01;01H[=3h[2J[01;01H[2J[01;01H[=3h[2J[01;01H[2J[01;01H[=3h[2J[01;01H[0m[35m[40m[0m[37m[40merror:
 no suitable video mode found.
EFI stub: Booting Linux Kernel...
EFI stub: EFI_RNG_PROTOCOL unavailable, KASLR will be disabled
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...

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https://bugs.launchpad.net/bugs/1930082

Title:
  systemd/247.3-3ubuntu3 ADT test failure with linux-raspi H/G/F

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