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The scheme where the thermal driver displayed the
cooling mode /proc/acpi/thermal_zone/*/cooling_mode
was flawed in two ways.
First, the success of _SCP doesn't actually mean
that the BIOS moved any trip points.
On many BIOS, _SCP is present, but does nothing.
So displaying what _SCP executed actually
was wrong more times than it was right.
Second, examining the relative position of the
trip points when the thermal_zone is added
is insufficient -- as the BIOS reserves the right
to change the trip points at run-time.
The only reliable way for the user to determine if
the thermal zone is in active, passive, or critical
mode is to examine the relative position of the trip points.
The user can do this without the kernel doing it
for them by looking in /proc/acpi/thermal_zone/*/trip_points
New contents for /proc/acpi/thermal_zone/*/cooling_mode:
If _SCP available:
"0 - Active; 1 - Passive\n"
If _SCP unavailable:
"<setting not supported>\n"
Signed-off-by: Len Brown <len.brown@intel.com>
eaca2d3f6c