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Three recursive levels of nested Xephyr sessions, running on Linux Mint
Original author(s) Matthew Allum
Developer(s) freedesktop.org
Initial release January 1, 2007; 9 years ago (2007-01-01)
Stable release 1.18.0 (November 9, 2015; 12 months ago (2015-11-09)[1]) [±]
Written in C
Type Display server
License MIT License
Website freedesktop.org/.../Xephyr

Xephyr is a display server implementing the X11 display server protocol based on KDrive which targets a window on a host X Server as its framebuffer. It is written by Matthew Allum. Xephyr is an X-on-X implementation and runs on X.Org Server and supports Glamor.[2] Future versions could make use of libinput.[citation needed] Replacing Xephyr with the xf86-video-dummy and xf86-video-nested drivers in the normal X.Org server is being considered as part of X11R7.8.[3]


Unlike the similar Xnest, Xephyr supports modern X extensions (even if host server doesn't) such as composite, damage, randr, etc. It uses SHM images and shadow framebuffer updates to provide good performance. It also has a visual debugging mode for observing screen updates.


Xephyr doesn't pick up the correct keyboard configuration from evdev-based keyboard drivers, so users must configure Xephyr's keyboard layout manually when using such keyboard drivers.[citation needed]

Xorg's version of Xephyr only supports software rendering for OpenGL, but Feng Haitao has developed a forked version of Xephyr which supports hardware-accelerated rendering if the underlying X server supports it.

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