diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index 76b1135d401a6eb3b4851fe344fe6f052f70300f..447fa9e33ffbeaaca7bbee58621900cbf0ba2b1e 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -638,6 +638,13 @@ static int __init acpi_parse_fadt(unsigned long phys, unsigned long size)
 			return 0;
 
 		pmtmr_ioport = fadt->xpm_tmr_blk.address;
+		/*
+		 * "X" fields are optional extensions to the original V1.0
+		 * fields, so we must selectively expand V1.0 fields if the
+		 * corresponding X field is zero.
+	 	 */
+		if (!pmtmr_ioport)
+			pmtmr_ioport = fadt->V1_pm_tmr_blk;
 	} else {
 		/* FADT rev. 1 */
 		pmtmr_ioport = fadt->V1_pm_tmr_blk;
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index fe1e8126fbae836d72ba045744ae5894cbd6d3a3..fce21c257523b729c68d29d201b41a7a762b5e31 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -197,7 +197,6 @@ config ACPI_ASUS
 config ACPI_IBM
 	tristate "IBM ThinkPad Laptop Extras"
 	depends on X86
-	default y
 	---help---
 	  This is a Linux ACPI driver for the IBM ThinkPad laptops. It adds
 	  support for Fn-Fx key combinations, Bluetooth control, video
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index a18243488c666cad223183fbe54726f9ba26fbed..5984b4f6715a95064e72d53938a4f8681bbb5714 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -16,7 +16,7 @@ EXTRA_CFLAGS	+= $(ACPI_CFLAGS)
 # ACPI Boot-Time Table Parsing
 #
 obj-y				+= tables.o
-obj-y				+= blacklist.o
+obj-$(CONFIG_X86)		+= blacklist.o
 
 #
 # ACPI Core Subsystem (Interpreter)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 4217925626423db1f39cc76880e95f700fb5d279..0c561c571f29a40f09dce5e96e9af29f79376fe4 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -543,6 +543,8 @@ static int acpi_processor_get_info(struct acpi_processor *pr)
 	return_VALUE(0);
 }
 
+static void *processor_device_array[NR_CPUS];
+
 static int acpi_processor_start(struct acpi_device *device)
 {
 	int result = 0;
@@ -561,6 +563,19 @@ static int acpi_processor_start(struct acpi_device *device)
 
 	BUG_ON((pr->id >= NR_CPUS) || (pr->id < 0));
 
+	/*
+	 * Buggy BIOS check
+	 * ACPI id of processors can be reported wrongly by the BIOS.
+	 * Don't trust it blindly
+	 */
+	if (processor_device_array[pr->id] != NULL &&
+	    processor_device_array[pr->id] != (void *)device) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "BIOS reporting wrong ACPI id"
+			"for the processor\n"));
+		return_VALUE(-ENODEV);
+	}
+	processor_device_array[pr->id] = (void *)device;
+
 	processors[pr->id] = pr;
 
 	result = acpi_processor_add_fs(device);
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 70d8a6ec0920f1589525395a1550360a26cbd54f..83fd1b6c10c41e7ddb62c271661523ef3affafc9 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -280,6 +280,16 @@ static void acpi_processor_idle(void)
 
 	cx->usage++;
 
+#ifdef CONFIG_HOTPLUG_CPU
+	/*
+	 * Check for P_LVL2_UP flag before entering C2 and above on
+	 * an SMP system. We do it here instead of doing it at _CST/P_LVL
+	 * detection phase, to work cleanly with logical CPU hotplug.
+	 */
+	if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) && 
+	    !pr->flags.has_cst && acpi_fadt.plvl2_up)
+		cx->type = ACPI_STATE_C1;
+#endif
 	/*
 	 * Sleep:
 	 * ------
@@ -534,6 +544,15 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr)
 	pr->power.states[ACPI_STATE_C0].valid = 1;
 	pr->power.states[ACPI_STATE_C1].valid = 1;
 
+#ifndef CONFIG_HOTPLUG_CPU
+	/*
+	 * Check for P_LVL2_UP flag before entering C2 and above on
+	 * an SMP system. 
+	 */
+	if ((num_online_cpus() > 1) && acpi_fadt.plvl2_up)
+		return_VALUE(-ENODEV);
+#endif
+
 	/* determine C2 and C3 address from pblk */
 	pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
 	pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
@@ -690,7 +709,7 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
 
 	/* Validate number of power states discovered */
 	if (pr->power.count < 2)
-		status = -ENODEV;
+		status = -EFAULT;
 
       end:
 	acpi_os_free(buffer.pointer);
@@ -841,11 +860,11 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr)
 	 * this function */
 
 	result = acpi_processor_get_power_info_cst(pr);
-	if ((result) || (acpi_processor_power_verify(pr) < 2)) {
+	if (result == -ENODEV)
 		result = acpi_processor_get_power_info_fadt(pr);
-		if ((result) || (acpi_processor_power_verify(pr) < 2))
-			result = acpi_processor_get_power_info_default_c1(pr);
-	}
+
+	if ((result) || (acpi_processor_power_verify(pr) < 2))
+		result = acpi_processor_get_power_info_default_c1(pr);
 
 	/*
 	 * Set Default Policy
diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index 37528c3b64b02baeb0aafbae96f2775495177453..f37584015324ac54b3471351dc4964170c467204 100644
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -101,9 +101,7 @@ static unsigned int acpi_thermal_cpufreq_is_init = 0;
 static int cpu_has_cpufreq(unsigned int cpu)
 {
 	struct cpufreq_policy policy;
-	if (!acpi_thermal_cpufreq_is_init)
-		return -ENODEV;
-	if (!cpufreq_get_policy(&policy, cpu))
+	if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
 		return -ENODEV;
 	return 0;
 }
@@ -127,13 +125,13 @@ static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
 	if (!cpu_has_cpufreq(cpu))
 		return -ENODEV;
 
-	if (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
+	if (cpufreq_thermal_reduction_pctg[cpu] > 20)
 		cpufreq_thermal_reduction_pctg[cpu] -= 20;
-		cpufreq_update_policy(cpu);
-		return 0;
-	}
-
-	return -ERANGE;
+	else
+		cpufreq_thermal_reduction_pctg[cpu] = 0;
+	cpufreq_update_policy(cpu);
+	/* We reached max freq again and can leave passive mode */
+	return !cpufreq_thermal_reduction_pctg[cpu];
 }
 
 static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
@@ -200,7 +198,7 @@ int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
 	int result = 0;
 	struct acpi_processor *pr = NULL;
 	struct acpi_device *device = NULL;
-	int tx = 0;
+	int tx = 0, max_tx_px = 0;
 
 	ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
 
@@ -259,19 +257,27 @@ int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
 		/* if going down: T-states first, P-states later */
 
 		if (pr->flags.throttling) {
-			if (tx == 0)
+			if (tx == 0) {
+				max_tx_px = 1;
 				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 						  "At minimum throttling state\n"));
-			else {
+			} else {
 				tx--;
 				goto end;
 			}
 		}
 
 		result = acpi_thermal_cpufreq_decrease(pr->id);
-		if (result == -ERANGE)
+		if (result) {
+			/*
+			 * We only could get -ERANGE, 1 or 0.
+			 * In the first two cases we reached max freq again.
+			 */
 			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 					  "At minimum performance state\n"));
+			max_tx_px = 1;
+		} else
+			max_tx_px = 0;
 
 		break;
 	}
@@ -290,8 +296,10 @@ int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
 				  pr->limit.thermal.px, pr->limit.thermal.tx));
 	} else
 		result = 0;
-
-	return_VALUE(result);
+	if (max_tx_px)
+		return_VALUE(1);
+	else
+		return_VALUE(result);
 }
 
 int acpi_processor_get_limit_info(struct acpi_processor *pr)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 23e2c6968a1164f9f54aa6f9a5493c619965019a..31218e1d2a18313a8ea9410c3bbab5934bb7b396 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1110,7 +1110,7 @@ acpi_add_single_object(struct acpi_device **child,
 	 *
 	 * TBD: Assumes LDM provides driver hot-plug capability.
 	 */
-	result = acpi_bus_find_driver(device);
+	acpi_bus_find_driver(device);
 
       end:
 	if (!result)
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index a24847c08f7f43d47cc28b33440e5d8d1bd04268..19f3ea48475e369ec9ba1b39405e5d14da9a2e6f 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -72,7 +72,7 @@
 #define _COMPONENT		ACPI_THERMAL_COMPONENT
 ACPI_MODULE_NAME("acpi_thermal")
 
-    MODULE_AUTHOR("Paul Diefenbaugh");
+MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION(ACPI_THERMAL_DRIVER_NAME);
 MODULE_LICENSE("GPL");
 
@@ -517,9 +517,9 @@ static int acpi_thermal_hot(struct acpi_thermal *tz)
 	return_VALUE(0);
 }
 
-static int acpi_thermal_passive(struct acpi_thermal *tz)
+static void acpi_thermal_passive(struct acpi_thermal *tz)
 {
-	int result = 0;
+	int result = 1;
 	struct acpi_thermal_passive *passive = NULL;
 	int trend = 0;
 	int i = 0;
@@ -527,7 +527,7 @@ static int acpi_thermal_passive(struct acpi_thermal *tz)
 	ACPI_FUNCTION_TRACE("acpi_thermal_passive");
 
 	if (!tz || !tz->trips.passive.flags.valid)
-		return_VALUE(-EINVAL);
+		return;
 
 	passive = &(tz->trips.passive);
 
@@ -547,7 +547,7 @@ static int acpi_thermal_passive(struct acpi_thermal *tz)
 				  trend, passive->tc1, tz->temperature,
 				  tz->last_temperature, passive->tc2,
 				  tz->temperature, passive->temperature));
-		tz->trips.passive.flags.enabled = 1;
+		passive->flags.enabled = 1;
 		/* Heating up? */
 		if (trend > 0)
 			for (i = 0; i < passive->devices.count; i++)
@@ -556,12 +556,32 @@ static int acpi_thermal_passive(struct acpi_thermal *tz)
 								 handles[i],
 								 ACPI_PROCESSOR_LIMIT_INCREMENT);
 		/* Cooling off? */
-		else if (trend < 0)
+		else if (trend < 0) {
 			for (i = 0; i < passive->devices.count; i++)
-				acpi_processor_set_thermal_limit(passive->
-								 devices.
-								 handles[i],
-								 ACPI_PROCESSOR_LIMIT_DECREMENT);
+				/*
+				 * assume that we are on highest
+				 * freq/lowest thrott and can leave
+				 * passive mode, even in error case
+				 */
+				if (!acpi_processor_set_thermal_limit
+				    (passive->devices.handles[i],
+				     ACPI_PROCESSOR_LIMIT_DECREMENT))
+					result = 0;
+			/*
+			 * Leave cooling mode, even if the temp might
+			 * higher than trip point This is because some
+			 * machines might have long thermal polling
+			 * frequencies (tsp) defined. We will fall back
+			 * into passive mode in next cycle (probably quicker)
+			 */
+			if (result) {
+				passive->flags.enabled = 0;
+				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+						  "Disabling passive cooling, still above threshold,"
+						  " but we are cooling down\n"));
+			}
+		}
+		return;
 	}
 
 	/*
@@ -571,23 +591,21 @@ static int acpi_thermal_passive(struct acpi_thermal *tz)
 	 * and avoid thrashing around the passive trip point.  Note that we
 	 * assume symmetry.
 	 */
-	else if (tz->trips.passive.flags.enabled) {
-		for (i = 0; i < passive->devices.count; i++)
-			result =
-			    acpi_processor_set_thermal_limit(passive->devices.
-							     handles[i],
-							     ACPI_PROCESSOR_LIMIT_DECREMENT);
-		if (result == 1) {
-			tz->trips.passive.flags.enabled = 0;
-			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-					  "Disabling passive cooling (zone is cool)\n"));
-		}
+	if (!passive->flags.enabled)
+		return;
+	for (i = 0; i < passive->devices.count; i++)
+		if (!acpi_processor_set_thermal_limit
+		    (passive->devices.handles[i],
+		     ACPI_PROCESSOR_LIMIT_DECREMENT))
+			result = 0;
+	if (result) {
+		passive->flags.enabled = 0;
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Disabling passive cooling (zone is cool)\n"));
 	}
-
-	return_VALUE(0);
 }
 
-static int acpi_thermal_active(struct acpi_thermal *tz)
+static void acpi_thermal_active(struct acpi_thermal *tz)
 {
 	int result = 0;
 	struct acpi_thermal_active *active = NULL;
@@ -598,74 +616,66 @@ static int acpi_thermal_active(struct acpi_thermal *tz)
 	ACPI_FUNCTION_TRACE("acpi_thermal_active");
 
 	if (!tz)
-		return_VALUE(-EINVAL);
+		return;
 
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
-
 		active = &(tz->trips.active[i]);
 		if (!active || !active->flags.valid)
 			break;
-
-		/*
-		 * Above Threshold?
-		 * ----------------
-		 * If not already enabled, turn ON all cooling devices
-		 * associated with this active threshold.
-		 */
 		if (tz->temperature >= active->temperature) {
+			/*
+			 * Above Threshold?
+			 * ----------------
+			 * If not already enabled, turn ON all cooling devices
+			 * associated with this active threshold.
+			 */
 			if (active->temperature > maxtemp)
-				tz->state.active_index = i, maxtemp =
-				    active->temperature;
-			if (!active->flags.enabled) {
-				for (j = 0; j < active->devices.count; j++) {
-					result =
-					    acpi_bus_set_power(active->devices.
-							       handles[j],
-							       ACPI_STATE_D0);
-					if (result) {
-						ACPI_DEBUG_PRINT((ACPI_DB_WARN,
-								  "Unable to turn cooling device [%p] 'on'\n",
-								  active->
-								  devices.
-								  handles[j]));
-						continue;
-					}
-					active->flags.enabled = 1;
-					ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-							  "Cooling device [%p] now 'on'\n",
-							  active->devices.
-							  handles[j]));
-				}
-			}
-		}
-		/*
-		 * Below Threshold?
-		 * ----------------
-		 * Turn OFF all cooling devices associated with this
-		 * threshold.
-		 */
-		else if (active->flags.enabled) {
+				tz->state.active_index = i;
+			maxtemp = active->temperature;
+			if (active->flags.enabled)
+				continue;
 			for (j = 0; j < active->devices.count; j++) {
 				result =
 				    acpi_bus_set_power(active->devices.
 						       handles[j],
-						       ACPI_STATE_D3);
+						       ACPI_STATE_D0);
 				if (result) {
 					ACPI_DEBUG_PRINT((ACPI_DB_WARN,
-							  "Unable to turn cooling device [%p] 'off'\n",
+							  "Unable to turn cooling device [%p] 'on'\n",
 							  active->devices.
 							  handles[j]));
 					continue;
 				}
-				active->flags.enabled = 0;
+				active->flags.enabled = 1;
 				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-						  "Cooling device [%p] now 'off'\n",
+						  "Cooling device [%p] now 'on'\n",
 						  active->devices.handles[j]));
 			}
+			continue;
+		}
+		if (!active->flags.enabled)
+			continue;
+		/*
+		 * Below Threshold?
+		 * ----------------
+		 * Turn OFF all cooling devices associated with this
+		 * threshold.
+		 */
+		for (j = 0; j < active->devices.count; j++) {
+			result = acpi_bus_set_power(active->devices.handles[j],
+						    ACPI_STATE_D3);
+			if (result) {
+				ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+						  "Unable to turn cooling device [%p] 'off'\n",
+						  active->devices.handles[j]));
+				continue;
+			}
+			active->flags.enabled = 0;
+			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+					  "Cooling device [%p] now 'off'\n",
+					  active->devices.handles[j]));
 		}
 	}
-
-	return_VALUE(0);
 }
 
 static void acpi_thermal_check(void *context);
@@ -744,15 +754,12 @@ static void acpi_thermal_check(void *data)
 	 * Again, separated from the above two to allow independent policy
 	 * decisions.
 	 */
-	if (tz->trips.critical.flags.enabled)
-		tz->state.critical = 1;
-	if (tz->trips.hot.flags.enabled)
-		tz->state.hot = 1;
-	if (tz->trips.passive.flags.enabled)
-		tz->state.passive = 1;
+	tz->state.critical = tz->trips.critical.flags.enabled;
+	tz->state.hot = tz->trips.hot.flags.enabled;
+	tz->state.passive = tz->trips.passive.flags.enabled;
+	tz->state.active = 0;
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
-		if (tz->trips.active[i].flags.enabled)
-			tz->state.active = 1;
+		tz->state.active |= tz->trips.active[i].flags.enabled;
 
 	/*
 	 * Calculate Sleep Time
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index f051b151580d7de14647213f6c4497a75a4eff57..d10668f146997d07c53630b722d15fad2054ed98 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -812,7 +812,7 @@ acpi_video_device_write_brightness(struct file *file,
 
 	ACPI_FUNCTION_TRACE("acpi_video_device_write_brightness");
 
-	if (!dev || count + 1 > sizeof str)
+	if (!dev || !dev->brightness || count + 1 > sizeof str)
 		return_VALUE(-EINVAL);
 
 	if (copy_from_user(str, buffer, count))