# TX2 NX Thermal Zones

**URL:** <https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839>\
**Category:** Jetson TX2\
**Tags:** thermal\
**Created:** [January 13, 2025, 5:08pm UTC](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839 "2025-01-13T17:08:05Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![tvu3](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tvu3](https://forums.developer.nvidia.com/u/tvu3)\
**Post date:** [January 13, 2025, 5:08pm UTC](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839/1 "2025-01-13T17:08:05Z")

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I’ve looked at this post about the TX2 NX thermal zones:

[TX2 NX Thermal Zones - Jetson & Embedded Systems / Jetson TX2 - NVIDIA Developer Forums](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/190447)

But I’m not clear.

In the thermal design guide Table 2-1, it states the T.gpu temperature is measured by the “ao-therm” sensor. Looking at tegrastats and the sysfs, I don’t see a reference to this sensor type.

Also, for zone5 or type “thermal-fan-est” where is the sensor located and what are the thresholds?  
the sysfs give this for thresholds but this doesn’t seem useful  
thermal-fan-est  
/sys/class/thermal/thermal\_zone5/trip\_point\_0\_temp : 0  
/sys/class/thermal/thermal\_zone5/trip\_point\_1\_temp : 46  
/sys/class/thermal/thermal\_zone5/trip\_point\_2\_temp : 60  
/sys/class/thermal/thermal\_zone5/trip\_point\_3\_temp : 68  
/sys/class/thermal/thermal\_zone5/trip\_point\_4\_temp : 76  
/sys/class/thermal/thermal\_zone5/trip\_point\_5\_temp : 140  
/sys/class/thermal/thermal\_zone5/trip\_point\_6\_temp : 150  
/sys/class/thermal/thermal\_zone5/trip\_point\_7\_temp : 160  
/sys/class/thermal/thermal\_zone5/trip\_point\_8\_temp : 170  
/sys/class/thermal/thermal\_zone5/trip\_point\_9\_temp : 180

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**Author:** ![kayccc](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/kayccc/32/14043_2.png) [@kayccc](https://forums.developer.nvidia.com/u/kayccc)\
**Post date:** [February 12, 2025, 5:21am UTC](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839/3 "2025-02-12T05:21:33Z")

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Sorry for the late response.  
Is this still an issue to support? Any result can be shared?

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<div class="post-metadata">

**Author:** ![tvu3](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@tvu3](https://forums.developer.nvidia.com/u/tvu3)\
**Post date:** [February 21, 2025, 7:26pm UTC](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839/4 "2025-02-21T19:26:44Z")

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Yes, what is thermal-fan-est sensor in the sysfs and what are its threshold/limits?

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**Author:** ![Trumany](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/trumany/32/14043_2.png) [@Trumany](https://forums.developer.nvidia.com/u/Trumany)\
**Post date:** [February 26, 2025, 9:48am UTC](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839/5 "2025-02-26T09:48:30Z")

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That’s for fan control. Please refer to [Jetson Orin NX Series and Jetson AGX Orin Series — Jetson Linux\<br/\>Developer Guide 34.1 documentation](https://docs.nvidia.com/jetson/archives/r34.1/DeveloperGuide/text/SD/PlatformPowerAndPerformance/JetsonOrinNxSeriesAndJetsonAgxOrinSeries.html#fan-profile-control)

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**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\
**Post date:** [March 26, 2025, 3:53am UTC](https://forums.developer.nvidia.com/t/tx2-nx-thermal-zones/319839/7 "2025-03-26T03:53:54Z")

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