Some additional testing done:
* If at cold boot I boot Windows 11 Pro first and then Linux (Debian or Ubuntu), Linux boots properly.
* If at cold boot I add "nomodeset" to kernel parameters in Grub, boot process will hang as well. It's even worse with this param, because ctrl+alt+del does not reboot machine.
I believe it must be related to either firmware loading, i915 module or both.
Some additional testing done:
* If at cold boot I boot Windows 11 Pro first and then Linux (Debian or Ubuntu), Linux boots properly.
* If at cold boot I add "nomodeset" to kernel parameters in Grub, boot process will hang as well. It's even worse with this param, because ctrl+alt+del does not reboot machine.
I believe it must be related to either firmware loading, i915 module or both.