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aux/acpi: correct fadt version check for new shutdown.

--- a/sys/src/cmd/aux/acpi.c

+++ b/sys/src/cmd/aux/acpi.c

@@ -496,7 +496,7 @@

 			amlload(t->data, l);

 		}else if(memcmp("FACP", t->sig, 4) == 0){

 			facp.ok = 1;

-			if(t->rev >= 2) {

+			if(t->rev >= 3) {

 				/* try the ACPI 2.0 method */

 				facp.pm1aspace = *(((uchar*)t) + 172);

 				facp.pm1awid = *(((uchar*)t) + 175);

-- 

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