diff --git a/src/soc/intel/apollolake/acpi.c b/src/soc/intel/apollolake/acpi.c
index a28894f044..b6d61b19d7 100644
--- a/src/soc/intel/apollolake/acpi.c
+++ b/src/soc/intel/apollolake/acpi.c
@@ -122,11 +122,7 @@ void soc_fill_fadt(acpi_fadt_t *fadt)
 
 	fadt->pm_tmr_blk = ACPI_BASE_ADDRESS + PM1_TMR;
 
-	fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
-	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
-
 	fadt->pm_tmr_len = 4;
-	fadt->duty_width = 3;
 
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
 
diff --git a/src/soc/intel/baytrail/acpi.c b/src/soc/intel/baytrail/acpi.c
index 445441e146..b91134fe20 100644
--- a/src/soc/intel/baytrail/acpi.c
+++ b/src/soc/intel/baytrail/acpi.c
@@ -272,17 +272,11 @@ static void generate_p_state_entries(int core, int cores_per_package)
 void generate_cpu_entries(const struct device *device)
 {
 	int core;
-	int pcontrol_blk = get_pmbase(), plen = 6;
 	const struct pattrs *pattrs = pattrs_get();
 
 	for (core = 0; core < pattrs->num_cpus; core++) {
-		if (core > 0) {
-			pcontrol_blk = 0;
-			plen = 0;
-		}
-
 		/* Generate processor \_SB.CPUx */
-		acpigen_write_processor(core, pcontrol_blk, plen);
+		acpigen_write_processor(core, 0, 0);
 
 		/* Generate  P-state tables */
 		generate_p_state_entries(core, pattrs->num_cpus);
diff --git a/src/soc/intel/baytrail/fadt.c b/src/soc/intel/baytrail/fadt.c
index 395bdd37f2..316df6f235 100644
--- a/src/soc/intel/baytrail/fadt.c
+++ b/src/soc/intel/baytrail/fadt.c
@@ -30,16 +30,12 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 	fadt->pm2_cnt_len = 1;
 	fadt->pm_tmr_len = 4;
 	fadt->gpe0_blk_len = 2 * (GPE0_EN - GPE0_STS);
-	fadt->p_lvl2_lat = 1;
-	fadt->p_lvl3_lat = 87;
-	fadt->duty_offset = 1;
-	fadt->duty_width = 0;
 	fadt->day_alrm = 0xd;
 	fadt->mon_alrm = 0x00;
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
 
 	fadt->flags |= ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
-			ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
+			ACPI_FADT_SLEEP_BUTTON |
 			ACPI_FADT_SEALED_CASE | ACPI_FADT_S4_RTC_WAKE |
 			ACPI_FADT_PLATFORM_CLOCK;
 
diff --git a/src/soc/intel/braswell/acpi.c b/src/soc/intel/braswell/acpi.c
index c70b69dc21..757358d0f5 100644
--- a/src/soc/intel/braswell/acpi.c
+++ b/src/soc/intel/braswell/acpi.c
@@ -280,17 +280,11 @@ static void generate_p_state_entries(int core, int cores_per_package)
 void generate_cpu_entries(const struct device *device)
 {
 	int core;
-	int pcontrol_blk = get_pmbase(), plen = 6;
 	const struct pattrs *pattrs = pattrs_get();
 
 	for (core = 0; core < pattrs->num_cpus; core++) {
-		if (core > 0) {
-			pcontrol_blk = 0;
-			plen = 0;
-		}
-
 		/* Generate processor \_SB.CPUx */
-		acpigen_write_processor(core, pcontrol_blk, plen);
+		acpigen_write_processor(core, 0, 0);
 
 		/* Generate  P-state tables */
 		generate_p_state_entries(core, pattrs->num_cpus);
diff --git a/src/soc/intel/braswell/fadt.c b/src/soc/intel/braswell/fadt.c
index 395bdd37f2..316df6f235 100644
--- a/src/soc/intel/braswell/fadt.c
+++ b/src/soc/intel/braswell/fadt.c
@@ -30,16 +30,12 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 	fadt->pm2_cnt_len = 1;
 	fadt->pm_tmr_len = 4;
 	fadt->gpe0_blk_len = 2 * (GPE0_EN - GPE0_STS);
-	fadt->p_lvl2_lat = 1;
-	fadt->p_lvl3_lat = 87;
-	fadt->duty_offset = 1;
-	fadt->duty_width = 0;
 	fadt->day_alrm = 0xd;
 	fadt->mon_alrm = 0x00;
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
 
 	fadt->flags |= ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
-			ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
+			ACPI_FADT_SLEEP_BUTTON |
 			ACPI_FADT_SEALED_CASE | ACPI_FADT_S4_RTC_WAKE |
 			ACPI_FADT_PLATFORM_CLOCK;
 
diff --git a/src/soc/intel/broadwell/pch/fadt.c b/src/soc/intel/broadwell/pch/fadt.c
index f13601dff0..bdce9a4882 100644
--- a/src/soc/intel/broadwell/pch/fadt.c
+++ b/src/soc/intel/broadwell/pch/fadt.c
@@ -29,11 +29,6 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 	fadt->pm2_cnt_len = 1;
 	fadt->pm_tmr_len = 4;
 	fadt->gpe0_blk_len = 32;
-	/* P_LVLx not used */
-	fadt->p_lvl2_lat = 101;
-	fadt->p_lvl3_lat = 1001;
-	fadt->duty_offset = 0;
-	fadt->duty_width = 0;
 	fadt->day_alrm = 0xd;
 	fadt->mon_alrm = 0x00;
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
diff --git a/src/soc/intel/common/block/acpi/acpi.c b/src/soc/intel/common/block/acpi/acpi.c
index 164631d14d..cff2e219fd 100644
--- a/src/soc/intel/common/block/acpi/acpi.c
+++ b/src/soc/intel/common/block/acpi/acpi.c
@@ -145,11 +145,10 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 	/* GPE0 STS/EN pairs each 32 bits wide. */
 	fadt->gpe0_blk_len = 2 * GPE0_REG_MAX * sizeof(uint32_t);
 
-	fadt->duty_offset = 1;
 	fadt->day_alrm = 0xd;
 
 	fadt->flags |= ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
-			ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
+			ACPI_FADT_SLEEP_BUTTON |
 			ACPI_FADT_SEALED_CASE | ACPI_FADT_S4_RTC_WAKE |
 			ACPI_FADT_PLATFORM_CLOCK;
 
@@ -398,8 +397,7 @@ __weak void soc_power_states_generation(int core_id,
 
 void generate_cpu_entries(const struct device *device)
 {
-	int core_id, cpu_id, pcontrol_blk = ACPI_BASE_ADDRESS;
-	int plen = 6;
+	int core_id, cpu_id;
 	int totalcores = dev_count_cpu();
 	unsigned int num_virt;
 	unsigned int num_phys;
@@ -413,14 +411,8 @@ void generate_cpu_entries(const struct device *device)
 
 	for (cpu_id = 0; cpu_id < numcpus; cpu_id++) {
 		for (core_id = 0; core_id < num_virt; core_id++) {
-			if (core_id > 0) {
-				pcontrol_blk = 0;
-				plen = 0;
-			}
-
 			/* Generate processor \_SB.CPUx */
-			acpigen_write_processor((cpu_id) * num_virt +
-						core_id, pcontrol_blk, plen);
+			acpigen_write_processor((cpu_id) * num_virt + core_id, 0, 0);
 
 			/* Generate C-state tables */
 			generate_c_state_entries();
diff --git a/src/soc/intel/denverton_ns/acpi.c b/src/soc/intel/denverton_ns/acpi.c
index 4384cadd9e..a28da48134 100644
--- a/src/soc/intel/denverton_ns/acpi.c
+++ b/src/soc/intel/denverton_ns/acpi.c
@@ -102,9 +102,6 @@ void soc_fill_fadt(acpi_fadt_t *fadt)
 	fadt->pm2_cnt_len = 1;
 	fadt->pm_tmr_len = 4;
 
-	fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
-	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
-
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
 
 	/* PM2 Control Registers */
diff --git a/src/soc/intel/denverton_ns/include/soc/msr.h b/src/soc/intel/denverton_ns/include/soc/msr.h
index 89caf44c17..21f3e7b41f 100644
--- a/src/soc/intel/denverton_ns/include/soc/msr.h
+++ b/src/soc/intel/denverton_ns/include/soc/msr.h
@@ -7,7 +7,6 @@
 #define MSR_PLATFORM_INFO 0xce
 #define PLATFORM_INFO_SET_TDP (1 << 29)
 #define MSR_PKG_CST_CONFIG_CONTROL 0xe2
-#define MSR_PMG_IO_CAPTURE_BASE 0xe4
 #define MSR_FEATURE_CONFIG 0x13c
 #define   FEATURE_CONFIG_RESERVED_MASK	0x3ULL
 #define   FEATURE_CONFIG_LOCK	(1 << 0)
diff --git a/src/soc/intel/elkhartlake/acpi.c b/src/soc/intel/elkhartlake/acpi.c
index 22b8767f48..abbb1ec206 100644
--- a/src/soc/intel/elkhartlake/acpi.c
+++ b/src/soc/intel/elkhartlake/acpi.c
@@ -160,9 +160,6 @@ void soc_fill_fadt(acpi_fadt_t *fadt)
 	fadt->x_pm_tmr_blk.addrl = pmbase + PM1_TMR;
 	fadt->x_pm_tmr_blk.addrh = 0x0;
 	fadt->preferred_pm_profile = PM_MOBILE;
-	fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
-	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
-	fadt->duty_width = 0x3;	/* CLK_VAL bits 3:1 */
 
 	if (config->s0ix_enable)
 		fadt->flags |= ACPI_FADT_LOW_PWR_IDLE_S0;
diff --git a/src/soc/intel/skylake/fadt.c b/src/soc/intel/skylake/fadt.c
index b8eb9d02e5..774974a76c 100644
--- a/src/soc/intel/skylake/fadt.c
+++ b/src/soc/intel/skylake/fadt.c
@@ -34,10 +34,6 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 	fadt->pm_tmr_len = 4;
 	/* There are 4 GPE0 STS/EN pairs each 32 bits wide. */
 	fadt->gpe0_blk_len = 2 * GPE0_REG_MAX * sizeof(uint32_t);
-	fadt->p_lvl2_lat = 1;
-	fadt->p_lvl3_lat = 87;
-	fadt->duty_offset = 1;
-	fadt->duty_width = 0;
 	fadt->day_alrm = 0xd;
 	fadt->mon_alrm = 0x00;
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_FREE;
@@ -45,7 +41,7 @@ void acpi_fill_fadt(acpi_fadt_t *fadt)
 		fadt->iapc_boot_arch |= ACPI_FADT_8042;
 
 	fadt->flags |= ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
-			ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
+			ACPI_FADT_SLEEP_BUTTON |
 			ACPI_FADT_SEALED_CASE | ACPI_FADT_S4_RTC_WAKE |
 			ACPI_FADT_PLATFORM_CLOCK;
 
diff --git a/src/soc/intel/xeon_sp/include/soc/msr.h b/src/soc/intel/xeon_sp/include/soc/msr.h
index 3d68bf2565..9a8b641b49 100644
--- a/src/soc/intel/xeon_sp/include/soc/msr.h
+++ b/src/soc/intel/xeon_sp/include/soc/msr.h
@@ -28,18 +28,9 @@
 /* No package C-state limit. All C-States supported by the processor are available. */
 #define PKG_CSTATE_LIMIT_MASK            (0xf << PKG_CSTATE_LIMIT_SHIFT)
 #define PKG_CSTATE_NO_LIMIT              (0x7 << PKG_CSTATE_LIMIT_SHIFT)
-#define IO_MWAIT_REDIRECTION_SHIFT       10
-#define IO_MWAIT_REDIRECTION_ENABLE      (1 << IO_MWAIT_REDIRECTION_SHIFT)
 #define CFG_LOCK_SHIFT                   15
 #define CFG_LOCK_ENABLE                  (1 << CFG_LOCK_SHIFT)
 
-/* MSR_PMG_IO_CAPTURE_BASE bits */
-#define MSR_PMG_IO_CAPTURE_BASE          0xe4
-#define LVL_2_BASE_ADDRESS_SHIFT         0 /* 15:0 bits */
-#define LVL_2_BASE_ADDRESS               (0x0514 << LVL_2_BASE_ADDRESS_SHIFT)
-#define CST_RANGE_SHIFT                  16 /* 18:16 bits */
-#define CST_RANGE_MAX_C6                 (0x1 << CST_RANGE_SHIFT)
-
 /* MSR_POWER_CTL bits */
 #define MSR_POWER_CTL                            0x1fc
 #define BIDIR_PROCHOT_ENABLE_SHIFT               0
diff --git a/src/soc/intel/xeon_sp/skx/cpu.c b/src/soc/intel/xeon_sp/skx/cpu.c
index 848c907e58..df2b9b3a00 100644
--- a/src/soc/intel/xeon_sp/skx/cpu.c
+++ b/src/soc/intel/xeon_sp/skx/cpu.c
@@ -54,14 +54,9 @@ static void xeon_sp_core_init(struct device *cpu)
 
 	/* set MSR_PKG_CST_CONFIG_CONTROL - scope per core*/
 	msr.hi = 0;
-	msr.lo = (PKG_CSTATE_NO_LIMIT | IO_MWAIT_REDIRECTION_ENABLE | CFG_LOCK_ENABLE);
+	msr.lo = (PKG_CSTATE_NO_LIMIT | CFG_LOCK_ENABLE);
 	wrmsr(MSR_PKG_CST_CONFIG_CONTROL, msr);
 
-	/* set MSR_PMG_IO_CAPTURE_BASE - scope per core */
-	msr.hi = 0;
-	msr.lo = (LVL_2_BASE_ADDRESS | CST_RANGE_MAX_C6);
-	wrmsr(MSR_PMG_IO_CAPTURE_BASE, msr);
-
 	/* Enable Energy Perf Bias Access, Dynamic switching and lock MSR */
 	msr = rdmsr(MSR_POWER_CTL);
 	msr.lo |= (ENERGY_PERF_BIAS_ACCESS_ENABLE | PWR_PERF_TUNING_DYN_SWITCHING_ENABLE
diff --git a/src/soc/intel/xeon_sp/skx/soc_acpi.c b/src/soc/intel/xeon_sp/skx/soc_acpi.c
index 41039eabdd..23bb6d6e3c 100644
--- a/src/soc/intel/xeon_sp/skx/soc_acpi.c
+++ b/src/soc/intel/xeon_sp/skx/soc_acpi.c
@@ -48,11 +48,6 @@ void soc_fill_fadt(acpi_fadt_t *fadt)
 	fadt->pm2_cnt_len = 1;
 	fadt->pm_tmr_len = 4;
 
-	fadt->p_lvl2_lat = ACPI_FADT_C2_NOT_SUPPORTED;
-	fadt->p_lvl3_lat = ACPI_FADT_C3_NOT_SUPPORTED;
-
-	fadt->duty_width = 0;
-
 	/* RTC Registers */
 	fadt->mon_alrm = 0x00;
 	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;