--- unstable.orig/xen/arch/x86/acpi/cpu_idle.c
+++ unstable/xen/arch/x86/acpi/cpu_idle.c
@@ -58,7 +58,7 @@
 #include <xen/notifier.h>
 #include <xen/cpu.h>
 
-/*#define DEBUG_PM_CX*/
+#define DEBUG_PM_CX
 
 #define GET_HW_RES_IN_NS(msr, val) \
     do { rdmsrl(msr, val); val = tsc_ticks2ns(val); } while( 0 )
@@ -238,6 +238,9 @@ static char* acpi_cstate_method_name[] =
     "HALT"
 };
 
+struct reasons { unsigned long max, pwr, urg, nxt; };//temp
+static DEFINE_PER_CPU(struct reasons, reasons);//temp
+
 static void print_acpi_power(uint32_t cpu, struct acpi_processor_power *power)
 {
     uint32_t i, idle_usage = 0;
@@ -273,6 +276,8 @@ static void print_acpi_power(uint32_t cp
     printk((last_state_idx == 0) ? "   *" : "    ");
     printk("C0:\tusage[%08d] duration[%"PRId64"]\n",
            idle_usage, NOW() - idle_res);
+printk("max=%lx pwr=%lx urg=%lx nxt=%lx\n",//temp
+       per_cpu(reasons.max, cpu), per_cpu(reasons.pwr, cpu), per_cpu(reasons.urg, cpu), per_cpu(reasons.nxt, cpu));
 
     print_hw_residencies(cpu);
 }
@@ -501,6 +506,7 @@ static void acpi_processor_idle(void)
     u32 exp = 0, pred = 0;
     u32 irq_traced[4] = { 0 };
 
+next_state = 1;//temp
     if ( max_cstate > 0 && power && !sched_has_urgent_vcpu() &&
          (next_state = cpuidle_current_governor->select(power)) > 0 )
     {
@@ -519,6 +525,10 @@ static void acpi_processor_idle(void)
     }
     if ( !cx )
     {
+this_cpu(reasons.max) += max_cstate <= 0;//temp
+this_cpu(reasons.pwr) += !power;//temp
+this_cpu(reasons.urg) += !!sched_has_urgent_vcpu();//temp
+this_cpu(reasons.nxt) += next_state <= 0;//temp
         if ( pm_idle_save )
             pm_idle_save();
         else
@@ -1007,6 +1017,7 @@ static void set_cx(
         cx->entry_method = ACPI_CSTATE_EM_SYSIO;
         break;
     default:
+printk("CPU%u: C%u space %x?\n", acpi_power->cpu, xen_cx->type, xen_cx->reg.space_id);//temp
         cx->entry_method = ACPI_CSTATE_EM_NONE;
         break;
     }
@@ -1015,7 +1026,7 @@ static void set_cx(
     cx->target_residency = cx->latency * latency_factor;
 
     smp_wmb();
-    acpi_power->count++;
+    acpi_power->count += (cx->type != ACPI_STATE_C1);
     if ( cx->type == ACPI_STATE_C1 || cx->type == ACPI_STATE_C2 )
         acpi_power->safe_state = cx;
 }
@@ -1141,6 +1152,7 @@ long set_cx_pminfo(uint32_t cpu, struct 
 
     /* FIXME: C-state dependency is not supported by far */
 
+printk("CPU%u: %pS, %pS\n", cpu, pm_idle_save, pm_idle);//temp
     if ( cpu_id == 0 )
     {
         if ( pm_idle_save == NULL )