--- kernel/bsd/dev/ppc/drvPMU/pmu.m	2018/04/24 18:26:05	1.1
+++ kernel/bsd/dev/ppc/drvPMU/pmu.m	2018/04/24 18:30:36	1.1.1.2
@@ -33,6 +33,7 @@
 #import <bsd/sys/time.h>
 #import <sys/callout.h>
 #import <machdep/ppc/proc_reg.h>
+#import <machdep/ppc/powermac.h>
 #import <driverkit/generalFuncs.h>
 #import <driverkit/kernelDriver.h>
 #import <driverkit/interruptMsg.h>
@@ -135,8 +136,14 @@ kprintf("PMU probe\n");
   // This is a still sleazy hack...
   oldIRQs = [deviceDescription interruptList];
 
-  // This is another sleazy hack. The second irq is two lower in the via table.
-  tmpIRQ = ((*oldIRQs ^ 0x18) + 2) ^ 0x18;
+  if (IsSawtooth()) {
+    // On Sawtooth it is ExtInt1...
+    tmpIRQ = 47 ^ 0x18;
+  } else {
+    // This is another sleazy hack.
+    //The second irq is two lower in the via table.
+    tmpIRQ = ((*oldIRQs ^ 0x18) + 2) ^ 0x18;
+  }
 
   newIRQs[0] = *oldIRQs;
   newIRQs[1] = tmpIRQ;