# HyperPixel Brightness \[SOLVED\]

**URL:** https://forums.pimoroni.com/t/hyperpixel-brightness-solved/12988
**Category:** Support
**Created:** [February 8, 2020, 10:42am UTC](https://forums.pimoroni.com/t/hyperpixel-brightness-solved/12988 "2020-02-08T10:42:09Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![rupy](https://avatars.discourse-cdn.com/v4/letter/r/d6d6ee/32.png) [@rupy](https://forums.pimoroni.com/u/rupy)
#### Post date: [February 8, 2020, 10:42am UTC](https://forums.pimoroni.com/t/hyperpixel-brightness-solved/12988/1 "2020-02-08T10:42:09Z")

</div>

I tried the workaround instructions found in this thread:

> <https://github.com/pimoroni/hyperpixel/issues/11>
>
> After reading through the product page and the sources here multiple times I'm still not sure if the HyperPixel hardware supports...

But I can’t get it to work, trying to read the GPIO with both gpio and raspi-gpio it seems gpio does not manage to affect values and does so silently!?

Also “gpio readall” breaks with “unable to determine board type… model: 17” so maybe the pi 4 is incompatible with wiringpi?

Why can’t raspi-gpio set pwm?

Looking at the dependent issue maybe it never was fixed?

What about just using the brightness file in /sys/class/backlight/rpi\_backlight?

Edit: You need to use the latest wiringpi on the pi 4:

wget [https://project-downloads.drogon.net/wiringpi-latest.deb](https://project-downloads.drogon.net/wiringpi-latest.deb)  
sudo dpkg -i wiringpi-latest.deb