Tachometer Oveflow on 6.11 kernel

Robotics & Edge Computing Jetson Systems Jetson Orin Nano
1

Hey,
I’m seeing a lot of tachometer overflow message when running JP 6.2 with 6.11 kernel (Ubuntu 24.04.2 LTS HWE kernel + patches: GitHub - SkrilaxCZ/l4t-kernel at 6.11.0-29-tegra ) on Ubuntu 24.04.2 LTS.

pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected

It would seem to happen when the fan isn’t spinning once every 3 minutes or so: when temps are low - so fan not spinning is expected and appears to spin up normally when temps bump up (don’t see the message when the fan is running). Kernel code suggests the fan is stalling though (so it’s getting some power input even though it’s not supposed to?) and I didn’t see this happening with 6.8 kernel (Ubuntu 24.04.2 LTS GA kernel).

Is there some change that should be applied to tachometer for 6.11 kernel?

4

Hi,
This seems related to deviation between K6.11 and K6.8. We don’t have much experience on the kernel versions. Would need other users to share experience.

6

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