# PX4\_IOCTL disengages PWM ports 1-4

**URL:** <https://discuss.px4.io/t/px4-ioctl-disengages-pwm-ports-1-4/5558>\
**Category:** Uncategorized\
**Created:** [January 29, 2018, 5:33am UTC](https://discuss.px4.io/t/px4-ioctl-disengages-pwm-ports-1-4/5558 "2018-01-29T05:33:06Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Evaneee](https://discuss.px4.io/letter_avatar_proxy/v4/letter/e/85f322/32.png) [@Evaneee](https://discuss.px4.io/u/Evaneee)\
**Post date:** [May 30, 2019, 4:48am UTC](https://discuss.px4.io/t/px4-ioctl-disengages-pwm-ports-1-4/5558/4 "2019-05-30T04:48:59Z")

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> [@CaptainJL](#):
>
> clarrify, when i disa

> [@PWM app in nutshell doesn't change PWM values](https://discuss.px4.io/t/pwm-app-in-nutshell-doesnt-change-pwm-values/5682/6):
>
> same question but I find it that mc\_att\_control stop fw\_att\_control stop motor\_ramp sine 1100 0.5 and then pwm test -a -p 1100 will be in effect I dont konw why wish you to find the reason

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