this post was submitted on 30 Jun 2023
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Clarification: GBM is what Intel, AMD and the general "nice players" of the Linux graphics ecosystem decided, whereas EGLStreams was something NVidia came up with because it worked better with their proprietary drivers (AFAIK)
Gnome and KDE were fine going out of their way to support both, but smaller implementations such as wlroots (the thing behind sway and Hyprland and other non-Weston "window managers") didn't feel the tradeoff was worth it (in both philosophical and manpower reasons) and stuck to GBM.
NVidia comparatively recently "caved in" and got GBM support working (alongside kernel mode setting, PRIME & other terms you don't really need to know about), and being one of the few proprietary players in the ecosystem they have not been able to benefit from help from the community, which is one of the reasons why their Wayland support is immature compared to the likes of Intel and AMD.