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.
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.