note to self....

Got this from the Google cache:
[note that under SuSE 9.2 the XF86Config file says "do not edit", but there does not appear any way to add these options using SaX2 -ed.]

"Slow rendering of graphics: On Linux with Xfree4, if I move a window on top of the graphics window the graphics windows is continuously redrawn. It seems that the graphics windows needs to be re-rendered every time I do something with any other window.

"If your X server is run with backing store you won't have this problem. If backing store is present scilab does nothing, If there is no backing store then Scilab redraw graphics to emulate backing store (we will certainly change this in the future). By default, it seems that Xfree4 does not use backing store. Here is a remedy proposed by Lydia van Dijk: Those folks using XFree86 4.x can put the backing-store and the save-under setting into their XF86Config files and in the Screen sections:

Section "Screen"
# more stuff here

Option "backing_store"
Option "save_unders"

# probably even more stuff here
EndSection

"On Suse the configuration file is /etc/X11/XF86Config, on
Mandrake 8.1, XFree86-4.1.0-17mdk maybe like Redhat 7.1 (7.2):
it is in /etc/X11/XF86Config-4."