--- linux/kernel/chr_drv/vt.c	2018/04/24 18:08:17	1.1.1.1
+++ linux/kernel/chr_drv/vt.c	2018/04/24 18:10:13	1.1.1.2
@@ -15,6 +15,7 @@
 
 #include <linux/sched.h>
 #include <linux/tty.h>
+#include <linux/timer.h>
 #include <linux/kernel.h>
 
 #include "vt_kern.h"
@@ -23,9 +24,8 @@
  * console (vt and kd) routines, as defined by usl svr4 manual
  */
 
-struct vt_cons vt_cons[MAX_CONSOLES];
+struct vt_cons vt_cons[NR_CONSOLES];
 
-extern int NR_CONSOLES;
 extern unsigned char kleds;
 extern unsigned char kraw;
 extern unsigned char ke0;
@@ -121,7 +121,17 @@ vt_ioctl(struct tty_struct *tty, int dev
 		default:
 			return -EINVAL;
 		}
-		vt_cons[console].vt_mode = arg;
+		if (vt_cons[console].vt_mode == (unsigned char) arg)
+			return 0;
+		vt_cons[console].vt_mode = (unsigned char) arg;
+		if (console != fg_console)
+			return 0;
+		if (arg == KD_TEXT)
+			unblank_screen();
+		else {
+			timer_active &= 1<<BLANK_TIMER;
+			blank_screen();
+		}
 		return 0;
 	case KDGETMODE:
 		verify_area((void *) arg, sizeof(unsigned long));
@@ -154,8 +164,7 @@ vt_ioctl(struct tty_struct *tty, int dev
 		}
 		else
 			return -EINVAL;
-		flush(tty->read_q);
-		flush(tty->secondary);
+		flush_input(tty);
 		return 0;
 	case KDGKBMODE:
 		verify_area((void *) arg, sizeof(unsigned long));