EXA(4)			   Kernel Interfaces Manual			EXA(4)



NAME
       exa - new 2D acceleration architecture for X.Org

DESCRIPTION
       EXA  provides a simple API for video drivers to implement for 2D accel-
       eration.	 It is a module loaded by drivers, and is not intended	to  be
       loaded  on  its	own.   See your driver's manual page for how to enable
       EXA.

       The EXA architecture is designed to make accelerating the Render exten-
       sion simple and efficient, and results in various performance tradeoffs
       compared to XAA.	 Some xorg.conf options are  available	for  debugging
       performance issues or driver rendering problems.	 They are not intended
       for general use.

       Option "EXANoComposite" "boolean"
	      Disables acceleration of the Composite operation,	 which	is  at
	      the heart of the Render extension.  Not related to the Composite
	      extension.  Default: No.

       Option "EXANoUploadToScreen" "boolean"
	      Disables acceleration of uploading pixmap	 data  to  the	frame-
	      buffer. Default: No.

       Option "EXANoDownloadFromScreen" "boolean"
	      Disables	acceleration  of  downloading  of pixmap data from the
	      framebuffer.  NOTE: Not usable with drivers which rely on	 Down-
	      loadFromScreen succeeding.  Default: No.

       Option "MigrationHeuristic" "anystr"
	      Chooses  an  alternate pixmap migration heuristic, for debugging
	      purposes.	 The default is intended to be the best performing one
	      for general use, though others may help with specific use cases.
	      Available	 options  include  "always",  "greedy",	 and  "smart".
	      Default: always.

SEE ALSO
       Xorg(1), xorg.conf(5).

AUTHORS
       Authors	include:  Keith	 Packard,  Eric Anholt, Zack Rusin, and Michel
       Danzer



X Version 11		      xorg-server 1.17.4			EXA(4)