# NVPM ERROR using nvpmodel even with sudo

**URL:** <https://forums.developer.nvidia.com/t/nvpm-error-using-nvpmodel-even-with-sudo/72570>\
**Category:** Jetson AGX Xavier\
**Created:** [April 5, 2019, 1:44pm UTC](https://forums.developer.nvidia.com/t/nvpm-error-using-nvpmodel-even-with-sudo/72570 "2019-04-05T13:44:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jorge.navarro](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jorge.navarro](https://forums.developer.nvidia.com/u/jorge.navarro)\
**Post date:** [April 5, 2019, 1:44pm UTC](https://forums.developer.nvidia.com/t/nvpm-error-using-nvpmodel-even-with-sudo/72570/1 "2019-04-05T13:44:06Z")

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I’m not able to change the clock configuration using nvpmodel

```auto
$ sudo nvpmodel -m 2
NVPM ERROR: Error opening /sys/kernel/nvpmodel_emc_cap/nafll_cvnas: 2
NVPM ERROR: failed to write PARAM CVNAS: ARG MAX_FREQ: PATH: /sys/kernel/nvpmodel_emc_cap/nafll_cvnas VAL: 716800000
NVPM ERROR: failed to set power mode!
NVPM ERROR: Failed to exec option requests!

```

When I go to /sys/kernel/nvpmodel\_emc\_cap/ I can’t find nafll\_cvnas, so it seems like the error makes sense, cause it is not available at all.

Where is the missing file?

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**Author:** ![linuxdev](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/linuxdev/32/10243_2.png) [@linuxdev](https://forums.developer.nvidia.com/u/linuxdev)\
**Post date:** [April 5, 2019, 7:02pm UTC](https://forums.developer.nvidia.com/t/nvpm-error-using-nvpmodel-even-with-sudo/72570/2 "2019-04-05T19:02:19Z")

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I haven’t checked that particular nvpmodel for function, but all of the files in “/sys” are pseudo files and not real files. Each of those are actually a “fake” file in ram created by a kernel driver. Lack of that file implies lack of that driver or lack of a kernel feature. Have you modified the kernel or kernel config?

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<div class="post-metadata">

**Author:** ![jorge.navarro](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@jorge.navarro](https://forums.developer.nvidia.com/u/jorge.navarro)\
**Post date:** [April 10, 2019, 9:08am UTC](https://forums.developer.nvidia.com/t/nvpm-error-using-nvpmodel-even-with-sudo/72570/3 "2019-04-10T09:08:02Z")

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Yeah, you are right. Some time ago I was testing some kernel features for preempt-rt kernel and it seems I forgot to undo something. After updating the kernel with the standard Image coming with Linux\_for\_Tegra, nvpmodel is working again as expected.

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**Author:** ![TomNVIDIA](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/tomnvidia/32/14181_2.png) [@TomNVIDIA](https://forums.developer.nvidia.com/u/TomNVIDIA)\
**Post date:** [October 18, 2021, 6:24pm UTC](https://forums.developer.nvidia.com/t/nvpm-error-using-nvpmodel-even-with-sudo/72570/4 "2021-10-18T18:24:50Z")

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Closed on October 18, 2021, 6:24pm UTC