Hi Rob, Thanks for the answer.so as per the definitions I understand the below points. a) frame buffer here signifies the scan out buffer which encompasses complete display. b)when I see the definition of plane in the doc book it says " planes are associated with a frame buffer to crop a portion of the image source and optionally scale it to destination size". I assume this is not the same frame buffer as point a. c)planes are overlayed or blended over the scanout buffer. Regards, Anand <div class="gmail_quote">On 23-May-2014 7:25 PM, "Rob Clark" <<a href="mailto:robdclark@gmail.com">robdclark@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> See: <a href="http://people.freedesktop.org/~danvet/drm/drm-mode-setting.html#idp57325824" target="_blank">http://people.freedesktop.org/~danvet/drm/drm-mode-setting.html#idp57325824</a> although the docbook probably should be updated (now that we have primary-planes) to read something more like: "...that provide a source of pixels to scanout to a plane" (since a plane is basically the part of display controller block that reads in the pixel data from the fb) On Thu, May 22, 2014 at 6:30 PM, Anand Sinha <<a href="mailto:anand.sinha85@gmail.com">anand.sinha85@gmail.com</a>> wrote: > Hello, > > Can someone help me understand the basic difference between a plane and a > frame buffer. > > Regards, > Anand > > > _______________________________________________ > dri-devel mailing list > <a href="mailto:dri-devel@lists.freedesktop.org">dri-devel@lists.freedesktop.org</a> > <a href="http://lists.freedesktop.org/mailman/listinfo/dri-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/dri-devel</a> > </blockquote></div>