kdrive/fbdev: Add the options Xfbdev supports to the man page

Signed-off-by: stefan11111 <stefan11111github@gmail.com>

hw/kdrive/fbdev/Xfbdev.man

@@ -17,6 +17,54 @@ provided by the Linux framebuffer device.
 .B Xfbdev
 accepts the common options of the Xkdrive family of servers.  Please
 see Xkdrive(1).
+
+.B Xfbdev
+also accepts the following additional options:
+.TP 8
+.B -fb "</dev/fbxx>"
+sets the framebuffer device path the X server will use.
+.TP 8
+.B -dri "[string]"
+enables DRI3 support for the X server.
+
+If
+.B string
+is a card node (/dev/dri/cardxx), or a render node (/dev/dri/renderDxxx),
+then that device node will be used by glamor for DRI3 support.
+
+If
+.B string
+is either auto or not passed at all, then glamor will
+try to pick a dri card node suitable for direct rendering.
+.TP 8
+.B -drm-master
+tells the X server to enable master permissions on the dri fd it uses
+(if DRI3 is enabled).
+.TP 8
+.B -noshadow
+disables the ShadowFB layer on supported hw, may slightly increase performance.
+May also lead to flickering.
+.TP 8
+.B -glamor
+force enables glamor render acceleration (even on top of sw renderers like softpipe/llvmpipe).
+.TP 8
+.B -noglamor
+force disables glamor render acceleration.
+Also disables DRI3 and X-Video support. GLX is still enabled.
+.TP 8
+.B -glvendor "<library>"
+tells the X server what gl vendor library to use.
+Particularly useful on multi-card systems.
+.TP 8
+-B -force-gl
+tells the X server to only use desktop OpenGL contexts.
+.TP 8
+-B -force-es
+tells the X server to only use embedded GLES contexts.
+.TP 8
+-B -noxv
+disables X-Video support.
+
 .SH KEYBOARD
 To be written.
 .SH SEE ALSO