brightness adjusts automatically

[reknae]

I have an HP envy x360, and the brightness adjusts up and down constantly, seemingly depending on the brightness of the page/background. This happens regardless of whether or not i have power saving mode enabled, and both plugged and unplugged. Even manually setting the brightness on the slider to 100 does not do anything if on a dark page. 

I work in photoshop a lot, so it's pretty impossible to work with colors when my brightness goes haywire all the time.

Someone said it's probably a power saving feature in my Intel settings, but I still haven't figured out how to disable it. 

Please help a desperate student. Thanks!

[Paul_Tikkanen]

Hi:

The only suggestion I can offer, would be to see if disabling the adaptive brightness setting resolves the problem, if you have not done so already...

https://windows.gadgethacks.com/how-to/disable-adaptive-brightness-windows-10-for-maximum-screen-bri...

[reknae]

Thanks for the response, but following this guide doesn't give me the same options.

Going 'power options' > 'edit plan setting' > 'change advanced power settings'  > 'display' > 'turn off display after'. 
No option for adaptive brightness where it should be, as in the guide. 

Also, i'm too much of a noob to know if it's at all relevant, but using AMD ryzen 5.