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vesa: *vesashadow -> *novesashadow

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -760,10 +760,10 @@

 .BR off .

 The first two specify differing levels of power saving;

 the third turns the monitor off completely.

-.SS \fL*vesashadow=\fP

-This enables the shadow framebuffer or softscreen of the VESA

-video driver. This is usefull on devices where access to

-the physical framebuffer is slow.

+.SS \fL*novesashadow=\fP

+This disables the shadow framebuffer or softscreen of the VESA

+video driver. This can improve performance on some graphics

+cards.

 .SS NVRAM

 .SS \fLnvram=\fIfile\fP

 .SS \fLnvrlen=\fIlength\fP

--- a/sys/src/9/pc/vgavesa.c

+++ b/sys/src/9/pc/vgavesa.c

@@ -162,10 +162,10 @@

 	vgalinearaddr(scr, paddr, size);

 	if(scr->apsize)

 		addvgaseg("vesascreen", scr->paddr, scr->apsize);

-	if(getconf("*vesashadow")){

-		hardscreen = scr->vaddr;

-		scr->paddr = scr->apsize = 0;

-	}

+	if(getconf("*novesashadow"))

+		return;

+	hardscreen = scr->vaddr;

+	scr->paddr = scr->apsize = 0;

 }

 static void

-- 

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