> I don't believe a driver is the correct thing to do. Xorg, in many places, assumes it's on raw hardware and does things like modesetting and VT switching, which obviously won't work in a nested environment.
Xorg 1.16 already avoids VT switching if it's a non-seat0 X server (i.e., if -seat option is launched with a non-seat0 value) or if HW_SKIP_CONSOLE flag is set in video driver in use. Current xf86-video-nested code already sets this flag, so I see no problem here. > Are you going to write an xf86-input-nested as well? It's not my priority. Nevertheless, current xf86-video-nested code has bultin input support, based on Xlib. > What's the reason you're trying to turn Xorg into a nested server? My main motivation is about single-GPU multiseat configuration, i.e., being able to set properly two seats using a single-GPU dual-head graphics card. Since there's no other way to launch a dedicated Xorg server for each video output of a dual-head graphics card (unless it's a dual-GPU one), my only possibility is a nested X server approach like that ones used in very first multiseat configurations several years ago (a bare X server spanning all available outputs, on top of which we start a nested X server for each output). Xephyr was often used for this approach, but it still lacks input hotplugging support, which is a major limitation for modern systemd-logind based multiseat. Moreover, with my experience in Xephyr-based multiseat setups, I feel that Xephyr was designed mainly for testing purposes, not for running a full desktop environment. On the other hand, Xorg 1.16 already has everything we need for systemd-logind based multiseat setups, so I think it's much easier to make it run nested to another X server than implementing the missing parts in Xephyr itself. Moreover, a pure-Xorg nested X server approach would make its configuration more transparent for display managers (for example, a Xephyr-based multiseat setup for GDM is currently impossible, since it doesn't allow X server command line customization). King regards, -- *Laércio de Sousa* *Orientador de Informática* *Escola Municipal "Professor Eulálio Gruppi"* *Rua Ismael da Silva Mello, 559, Mogi Moderno* *Mogi das Cruzes - SPCEP 08717-390* Telefone: (11) 4726-8313
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