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Subject[PATCH: 1/1] ACPI: make evaluation of thermal trip points before temperature or vice versa dependant on new "temp_b4_trip" module parameter to support older AMD x86_64s
From
This patch adds a new acpi.thermal.temp_b4_trip = 1 settting, which
causes the temperature
to be set before evaluation of thermal trip points (the old default) ;
this mode should
be selected automatically by DMI match if the system identifies as "HP
Compaq 6715b" .

Please consider applying a patch like that attached to fix the issue reported
in lkml thread "Re: PROBLEM: Performance drop" recently, whereby
it was found that HP 6715b laptops ( which have 2.2Ghz dual-core AMD
x86_64 k8 CPUs)
get stuck running the CPU at 800Khz and cannot switch frequency. I have verified
that this still the case with v3.4.4 tagged "stable" kernel.

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 7dbebea..de2b164 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -96,6 +96,10 @@ static int psv;
module_param(psv, int, 0644);
MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");

+static int temp_b4_trip;
+module_param(temp_b4_trip, int, 0);
+MODULE_PARM_DESC(temp_b4_trip, "Get the temperature before
initializing trip points.");
+
static int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device, int type);
static int acpi_thermal_resume(struct acpi_device *device);
@@ -941,27 +945,41 @@ static int acpi_thermal_get_info(struct
acpi_thermal *tz)
if (!tz)
return -EINVAL;

- /* Get trip points [_CRT, _PSV, etc.] (required) */
- result = acpi_thermal_get_trip_points(tz);
- if (result)
+ if( temp_b4_trip )
+ { /* some CPUs, eg AMD K8 need temperature before trip points
can be obtained */
+ /* Get temperature [_TMP] (required) */
+ result = acpi_thermal_get_temperature(tz);
+ if (result)
return result;
-
- /* Get temperature [_TMP] (required) */
- result = acpi_thermal_get_temperature(tz);
- if (result)
+
+ /* Get trip points [_CRT, _PSV, etc.] (required) */
+ result = acpi_thermal_get_trip_points(tz);
+ if (result)
return result;
-
+ }else
+ { /* newer x86_64s need trip points set before temperature
obtained */
+ /* Get trip points [_CRT, _PSV, etc.] (required) */
+ result = acpi_thermal_get_trip_points(tz);
+ if (result)
+ return result;
+
+ /* Get temperature [_TMP] (required) */
+ result = acpi_thermal_get_temperature(tz);
+ if (result)
+ return result;
+ }
+
/* Set the cooling mode [_SCP] to active cooling (default) */
result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
if (!result)
tz->flags.cooling_mode = 1;
-
+
/* Get default polling frequency [_TZP] (optional) */
if (tzp)
tz->polling_frequency = tzp;
else
acpi_thermal_get_polling_frequency(tz);
-
+
return 0;
}

@@ -1110,6 +1128,14 @@ static int thermal_psv(const struct dmi_system_id *d) {
return 0;
}

+static int thermal_temp_b4_trip(const struct dmi_system_id *d) {
+
+ printk(KERN_NOTICE "ACPI: %s detected: : "
+ "getting temperature before trip point
initialisation\n", d->ident);
+ temp_b4_trip = 1;
+ return 0;
+}
+
static struct dmi_system_id thermal_dmi_table[] __initdata = {
/*
* Award BIOS on this AOpen makes thermal control almost worthless.
@@ -1147,6 +1173,14 @@ static struct dmi_system_id thermal_dmi_table[]
__initdata = {
DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
},
},
+ {
+ .callback = thermal_temp_b4_trip,
+ .ident = "HP 6715b laptop",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6715b"),
+ },
+ },
{}
};
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