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Ühel kenal päeval, T, 08.06.2021 kell 18:04, kirjutas Adam Carter: |
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> I've noticed that my gdm system is running /usr/bin/Xwayland instead of |
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> /usr/bin/Xorg, so I infer that Gentoo devs, or upstream, are preferring |
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> it now. |
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It isn't really running in Xwayland really, it's running natively with |
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the Wayland protocol. Xwayland is a by-product of supporting |
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applications that still use X11 and settings for such applications. gdm |
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itself does not implement a GUI - it makes use of a login mode of |
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gnome-shell for that purpose. Future versions of GNOME will be able to |
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default to running Xwayland on-demand, so in the future you won't see |
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Xwayland running with just gdm, as no legacy applications are needed. |
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Right now I believe some accessibility things might need it still in |
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theory, so it isn't yet always skipped with GDM either. |
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GDM uses wayland when it can and all the support has been built for |
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that with USE=wayland on a bunch of packages, including GDM itself. |
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> Can i try Xwayland with startx? |
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No, Xwayland isn't something that can really run without a native |
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Wayland compositor, to my knowledge. |
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You can read up on what Xwayland is from |
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https://en.wikipedia.org/wiki/Wayland_(display_server_protocol)#Compatibility_with_X |
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and elsewhere through your favorite Internet search engine. |
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> pstree shows the execution paths as below. Inscrutable to me and |
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> interesting that they're so different. |
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> |
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> gdm: systemd -> gnome-shell -> Xwayland |
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> startx: startx -> xinit -> X (AND in parallel) gnome-session -> gnome- |
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> shell |
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startx is incapable of running Wayland sessions, so it forces the |
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legacy Xorg GNOME session, which you'd also get if you explicitly |
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choose "GNOME on Xorg" from gdm. |
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One big benefit of having GDM running with Wayland, even if you have to |
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pick Xorg for your GNOME due to some legacy app not supporting |
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screencasting portal or something along those lines, is that GDM when |
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using Wayland is capable of shutting down the gnome-shell it uses when |
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you aren't on GDM VT (i.e, have logged into a desktop session) and will |
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start it back up when you go back to GDM VT (i.e, you log out of your |
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desktop), which is not implemented for Xorg using GDM. This saves on |
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memory usage, as you don't have a background gnome-shell kept running. |
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Currently GDM also is incapable of starting Wayland session when it |
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itself isn't "using" Wayland. |
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Best, |
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Mart |
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