Comment 2 for bug 1672033

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Igor (invy) wrote : Re: Xorg does not work in rootless mode on nvidia proprietary drivers (GNOME)

Tim,

indeed, if KMS is enabled, gdm starts perfectly in wayland mode and you can use gnome-shell wayland session (glx is however broken). But if you would like to use gnome-shell Xorg session, then gnome-shell will crash, because apparently gdm starts xorg in rootless mode (I presume uid of user being logged in, which makes logically sense).

This is exactly the problem: enabling KMS by default would break gnome-shell xorg session.

Regrading logs. Could you maybe give me some hints for what should I look, because nothing looks suspicious.

It's pretty clear, that xorg is lacking some permissions for some resources, but the question is, which exactly.