Index: linux/arch/i386/kernel/io_apic.c
diff -u linux/arch/i386/kernel/io_apic.c:1.2.12.3 linux/arch/i386/kernel/io_apic.c:1.2.12.4
--- linux/arch/i386/kernel/io_apic.c:1.2.12.3	Tue Apr  3 15:37:29 2001
+++ linux/arch/i386/kernel/io_apic.c	Thu May 17 10:30:20 2001
@@ -204,6 +204,8 @@
 /*
  * We disable IO-APIC IRQs by setting their 'destination CPU mask' to
  * zero. Trick by Ramesh Nalluri.
+ * Not anymore. This causes problems on some IO-APIC's, notably AMD 760MP's
+ * So we do it a more 2.4 kind of way now which should be safer -jerdfelt
  */
 DO_ACTION( mask,    0, |= 0x00010000, io_apic_sync(entry->apic))/* mask = 1 */
 DO_ACTION( unmask,  0, &= 0xfffeffff, )				/* mask = 0 */
@@ -646,8 +648,8 @@
 
 		entry.delivery_mode = dest_LowestPrio;
 		entry.dest_mode = 1;			/* logical delivery */
-		entry.mask = 0;				/* enable IRQ */
-		entry.dest.logical.logical_dest = 0xff;	/* but no route */
+		entry.mask = 1;				/* disable IRQ */
+		entry.dest.logical.logical_dest = 0xff;
 
 		idx = find_irq_entry(apic,pin,mp_INT);
 		if (idx == -1) {