Hello Iku-Tulo, thank you for the report.

Vilutar <ikutulovilutar@gmail.com> writes:
> intelfb: Version 0.9.6
> intelfb: Cannot reserve FB region

An unlikely guess: I have had problems with a black screen when using a
television as a screen.  However this does not sound like it.

> Then I tried `nomodeset video=uvesafb` Linux parameters and the GUI
> now rendered. I don't know if these work as a global workaround for
> other machines,

No, there have been reports that uvesafb does not work on every machine.

> should they be documented in the installation
> instructions?

Yes, if we can give proper instructions.  Perhaps the attached patch?

Regards,
Florian