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My question is similar to this. However I need to clarify some details.

  1. I can't find anything about this statement "I also read that the vc4 driver does not use the gpu_mem parameter, confusing things a bit." in the original question.

    Moreover, in Gentoo wiki https://wiki.gentoo.org/wiki/Raspberry_Pi_VC4 I see this: "It's also recommended to bump your gpu_mem to 128 (it's what raspi-config does when you enable the driver through it).", that means. that gpu_mem is used on every type of graphic mode.

  2. So we have xf86-video-fbturbo-git and KMS driver. First one is good for 2D acceleration, second one for 3d. But, as I know, KMS driver implements in xorg.conf via modesetting driver, which does not support 2D acceleration (https://linux.die.net/man/4/modesetting), so only 3D will work good but no 2D scrolling. Am I right?

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i dont know certainly, for those cases i just install a common OS, like raspbian that have much more support than others. i have been never had any graphics issue before with raspbian, if you want to add other kind of display devices you have to get correct codecs ( or drivers for each ).

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