Graphics flickering in most games

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@BluishHumility posted some details on how to do this here.

Screen Flickering on Intel iGPU Laptop

The ArchWiki article does not mention efibootmgr for this. That tool is not used for this purpose. Typically you would set kernel parameters with your bootloader, so they are incorporated into the process of starting the kernel. To do this with Grub, the instructions are here: https://wiki.archlinux.org/title/Kernel_parameters#GRUB. The most common way to do this is described in this section of the article: Edit /etc/default/grub and append your kernel options between the quotes in the GRUB…