Comment 35 for bug 1944397

@satmandu, re your comment #32: 5.11.22-9021-raspi is supposed to go along with current hirsute linux-firmware-raspi2 4-0ubuntu3. We don't want to bump the FW on hirsute. Also, the DTBS are provided by the kernel and not the firmware package.

And:
$ dpkg -i linux-image-5.11.22-9021-raspi_...
$ flash-kernel --force 5.11.22-9021-raspi
$ md5sum /boot/dtb-5.11.22-9021-raspi /boot/firmware/bcm2711-rpi-4-b.dtb
f2f90ac1a0c075d3961914c2d345d4ae /boot/dtb-5.11.22-9021-raspi
f2f90ac1a0c075d3961914c2d345d4ae /boot/firmware/bcm2711-rpi-4-b.dtb

The DTBs are identical.

I'm not sure what you're trying to proof, especially since in comment #31 you claim that 5.11.22-9021-raspi works for you.

Can you do your testing without overclocking?