On Tue, Aug 12, 2003 at 01:26:11PM -0500, Andreakis, Dean (MED) wrote: > From a functionality point of view, what is the difference between > using Option "UseFBDev" and using the fb device driver directly via > Driver "fbdev" in XF86Config? > > Specifically, in the case where I specify Driver "radeon" and Option > "UseFBDev" exactly what parts of the radeon fb driver are used > instead/in place of the XFree86 radeon driver? Whats the diff between > this and just specifying Driver "fbdev" directly?
using a standard driver (like the radeon driver) with the UseFBDev option, uses the underlying fbdev for things like memory and mmio area detection, and for mode initialization and switching. The rests of it, including the accel engine, the video overlay and the 3D stuff is done with the radeon driver. When you use the fbdev driver, not only do you use the fbdev for detection and mode initialization, but you drive directly to the framebuffer memory, possibly using shadowfb to speed things up. There is no accel, nor video overlay possible though. I hope i did not leave anything out, and that this respond to your question. Friendly, Sven Luther _______________________________________________ Devel mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/devel
