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devvga: disable cursor on shutdown avoiding graphics glitches on reboot

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

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

@@ -86,6 +86,16 @@

 	conf.monitor = 1;

 }

+static void

+vgashutdown(void)

+{

+	VGAscr *scr;

+

+	scr = &vgascreen[0];

+	if(scr->cur && scr->cur->disable)

+		scr->cur->disable(scr);

+}

+

 static Chan*

 vgaattach(char* spec)

 {

@@ -484,7 +494,7 @@

 	vgareset,

 	devinit,

-	devshutdown,

+	vgashutdown,

 	vgaattach,

 	vgawalk,

 	vgastat,