# Debug

Thermal logging helps to understand the active configurations of the
thermal zones and the existing thermal mitigation levels. To retrieve
thermal configuration and active mitigation levels, use ftrace logs.

## ftrace method

To enable thermal ftace logs run the following commands:

echo 1 > /sys/kernel/tracing/events/thermal/enable
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Tab QCS6490/QCS5430
Tab QCS9075

The following are the log snippets of different thermal events:

/* In the following snippet, "cpu0-thermal" represents thermal zone and “temp” indicates existing temperature of thermal zone */
    sh-1420    [001] ..... 1132975.934216: thermal_temperature: thermal_zone=cpu0-thermal id=13 temp_prev=47700 temp=110000
    /*In the following snippet, “trip” indicates trip level and trip level 1 is triggered for cpu0-thermal thermal zone*/
    sh-1420    [001] ..... 1132975.934449: thermal_zone_trip: thermal_zone=cpu0-thermal id=13 trip=1 trip_type=PASSIVE
    /*In the following snippet, “type” represents the cooling device and "target" represents active mitigation of the cooling device*/
    sh-1420 [001] ..... 1132975.934473: cdev_update: type=idle-cpu0 target=100
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The following are the log snippets of mitigation trigger and clear thermal events for QCS9075:

/* In the following snippet, " cpu-1-2-1-thermal" represents thermal zone
    and “trip” indicates trip level and trip level 1 is triggered for
    cpu-1-2-1-thermal thermal zone*/
    irq/222-c252000-115     [000] ..... 250901.340001:
    thermal_zone_trip: thermal_zone=cpu-1-2-1-thermal
    id=16 trip=1 trip_type=PASSIVE
    /*In the following snippet, “type” represents the cooling device and "target" represents active mitigation of the cooling device*/
    irq/222-c252000-115     [000] ..... 250901.340009: cdev_update: type=idle-cpu6 target=100 kworker/u17:0-23271   [000] ..... 250901.355101:
    thermal_temperature: thermal_zone=cpu-1-2-1-thermal id=16 temp_prev=30100 temp=34100
    kworker/u17:0-23271   [000] ..... 250901.339084: thermal_temperature: thermal_zone=cpu-1-2-1-thermal id=16 temp_prev=30100 temp=29800
    kworker/u17:0-23271   [000] ..... 250901.339139: cdev_update: type=idle-cpu6 target=0
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Note

The log snippet for QCS8275 will be updated in a future release.

Last Published: Jan 26, 2025

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