diff --git a/sys/dev/acpica/acpi_cpu.c b/sys/dev/acpica/acpi_cpu.c
index 9a6a2995c798..cc0fd0a8ac24 100644
--- a/sys/dev/acpica/acpi_cpu.c
+++ b/sys/dev/acpica/acpi_cpu.c
@@ -703,7 +703,6 @@ acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc)
     sc->cpu_non_c2 = sc->cpu_cx_count;
     sc->cpu_non_c3 = sc->cpu_cx_count;
     sc->cpu_cx_count++;
-    cpu_deepest_sleep = 1;
 
     /* 
      * The spec says P_BLK must be 6 bytes long.  However, some systems
@@ -729,7 +728,6 @@ acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc)
 	    cx_ptr++;
 	    sc->cpu_non_c3 = sc->cpu_cx_count;
 	    sc->cpu_cx_count++;
-	    cpu_deepest_sleep = 2;
 	}
     }
     if (sc->cpu_p_blk_len < 6)
@@ -746,7 +744,6 @@ acpi_cpu_generic_cx_probe(struct acpi_cpu_softc *sc)
 	    cx_ptr->trans_lat = AcpiGbl_FADT.C3Latency;
 	    cx_ptr++;
 	    sc->cpu_cx_count++;
-	    cpu_deepest_sleep = 3;
 	}
     }
 }
@@ -831,7 +828,6 @@ acpi_cpu_cx_cst(struct acpi_cpu_softc *sc)
     cx_ptr->type = ACPI_STATE_C0;
     cx_ptr++;
     sc->cpu_cx_count++;
-    cpu_deepest_sleep = 1;
 
     /* Set up all valid states. */
     for (i = 0; i < count; i++) {
@@ -884,8 +880,6 @@ acpi_cpu_cx_cst(struct acpi_cpu_softc *sc)
 	    continue;
 	case ACPI_STATE_C2:
 	    sc->cpu_non_c3 = sc->cpu_cx_count;
-	    if (cpu_deepest_sleep < 2)
-		    cpu_deepest_sleep = 2;
 	    break;
 	case ACPI_STATE_C3:
 	default:
@@ -894,8 +888,7 @@ acpi_cpu_cx_cst(struct acpi_cpu_softc *sc)
 				 "acpi_cpu%d: C3[%d] not available.\n",
 				 device_get_unit(sc->cpu_dev), i));
 		continue;
-	    } else
-		cpu_deepest_sleep = 3;
+	    }
 	    break;
 	}
 
diff --git a/sys/kern/kern_clocksource.c b/sys/kern/kern_clocksource.c
index 8bacff61d2d7..61293173f22d 100644
--- a/sys/kern/kern_clocksource.c
+++ b/sys/kern/kern_clocksource.c
@@ -54,7 +54,6 @@ __FBSDID("$FreeBSD$");
 #include <machine/cpu.h>
 #include <machine/smp.h>
 
-int			cpu_deepest_sleep = 0;	/* Deepest Cx state available. */
 int			cpu_disable_c2_sleep = 0; /* Timer dies in C2. */
 int			cpu_disable_c3_sleep = 0; /* Timer dies in C3. */
 
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index c564547123a1..d9b5c1494082 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -321,7 +321,6 @@ sbintime_t 	cpu_idleclock(void);
 void	cpu_activeclock(void);
 void	cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt);
 void	cpu_et_frequency(struct eventtimer *et, uint64_t newfreq);
-extern int	cpu_deepest_sleep;
 extern int	cpu_disable_c2_sleep;
 extern int	cpu_disable_c3_sleep;
 
diff --git a/sys/x86/x86/tsc.c b/sys/x86/x86/tsc.c
index 3f36fbd9f8ac..7dcf77fc4315 100644
--- a/sys/x86/x86/tsc.c
+++ b/sys/x86/x86/tsc.c
@@ -542,7 +542,7 @@ init_TSC_tc(void)
 	 * result incorrect runtimes for kernel idle threads (but not
 	 * for any non-idle threads).
 	 */
-	if (cpu_deepest_sleep >= 2 && cpu_vendor_id == CPU_VENDOR_INTEL &&
+	if (cpu_vendor_id == CPU_VENDOR_INTEL &&
 	    (amd_pminfo & AMDPM_TSC_INVARIANT) == 0) {
 		tsc_timecounter.tc_flags |= TC_FLAGS_C2STOP;
 		if (bootverbose)