2 files changed, 12 insertions, 4 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 874f912962c4..8c5d7df7d343 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -213,7 +213,7 @@ static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event)
 
         switch (event) {
         case ACPI_EC_EVENT_IBE:
-                if (~acpi_ec_read_status(ec) & event) {
+                if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) {
                         ec->intr.expect_event = 0;
                         return 0;
                 }
@@ -782,12 +782,15 @@ static u32 acpi_ec_gpe_intr_handler(void *data)
         case ACPI_EC_EVENT_OBF:
                 if (!(value & ACPI_EC_FLAG_OBF))
                         break;
+                ec->intr.expect_event = 0;
+                wake_up(&ec->intr.wait);
+                break;
         case ACPI_EC_EVENT_IBE:
                 if ((value & ACPI_EC_FLAG_IBF))
                         break;
                 ec->intr.expect_event = 0;
                 wake_up(&ec->intr.wait);
-                return ACPI_INTERRUPT_HANDLED;
+                break;
         default:
                 break;
         }
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f8d2b2f47fd4..e439eb77d283 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -99,6 +99,9 @@ static int set_max_cstate(struct dmi_system_id *id)
 static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
         { set_max_cstate, "IBM ThinkPad R40e", {
           DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
+          DMI_MATCH(DMI_BIOS_VERSION,"1SET70WW")}, (void *)1},
+        { set_max_cstate, "IBM ThinkPad R40e", {
+          DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
           DMI_MATCH(DMI_BIOS_VERSION,"1SET60WW")}, (void *)1},
         { set_max_cstate, "IBM ThinkPad R40e", {
           DMI_MATCH(DMI_BIOS_VENDOR,"IBM"),
@@ -358,7 +361,9 @@ static void acpi_processor_idle(void)
                 t1 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Invoke C2 */
                 inb(cx->address);
-                /* Dummy op - must do something useless after P_LVL2 read */
+                /* Dummy wait op - must do something useless after P_LVL2 read
+                   because chipsets cannot guarantee that STPCLK# signal
+                   gets asserted in time to freeze execution properly. */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
@@ -396,7 +401,7 @@ static void acpi_processor_idle(void)
                 t1 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Invoke C3 */
                 inb(cx->address);
-                /* Dummy op - must do something useless after P_LVL3 read */
+                /* Dummy wait op (see above) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_fadt.xpm_tmr_blk.address);