Weird flicker when toggling on/off Athom bulbs with 0.15.0-b6

[Andro-Marian]

What happened?

When the fade-in starts and when fade-out is finishing. A weird flicked happens.
https://drive.google.com/file/d/1YgvZzD1sl7MFx1y-zQKS_JEvJhUdDfPS/view?usp=sharing

When turning on is starting to increase brightness, then turning instant off than on again. And vice versa.

To Reproduce Bug

Flash the 0.15.0-b6 or the release 0.15 to any Athom 7w or 15w.
Turn it on/off by the web interface.

I think was introduces in 0.15.0-b6. Works fine on 0.15.0-b5

Noticed a flicker when going on or off.

Expected Behavior

To be smooth as before.

Install Method

Binary from WLED.me

What version of WLED?

0.15-(b6/release)

Which microcontroller/board are you seeing the problem on?

ESP8266

Relevant log/trace output

No response

Anything else?

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[DedeHai]

I noticed this too when working on the new PWM outputs. It is related to fading value being offset from the starting and target value but I could not pin-point where this actually happens.

[Andro-Marian]

Not sure what was changed on Beta 6. Thinking if the #3196 was introduced first on b6. I originally posted there.
I see another post with flickering problems. Wandering if is related #4389.

[JorinL]

Hey there,
before opening a complete new - according to the video - it could be also my issue.

I think i might have the same thing - it "looks" pretty the same.

I have this problem on my 3 PWM strips.
When I cut the transitiontime it is gone - with transition it flashes when turning on before dimming up and when turning off while dimming down a flash and dimming further down.

I added a small video of the current situation.
https://github.com/user-attachments/assets/f6009672-1853-451c-b2fd-f404a0fe5acc

[marcolino7]

Hi,
same behavoiur here, WLED 0.15 on PWM RGBW strip. I reverted back to 0.14 and issue gone

[DedeHai]

I found one issue in the code related to CIE brightness curve calculation. Is the issue gone if you enable dithering in the PWM LED settings?
edit: scrap that, dithering is not avialable on ESP8266

[JorinL]

Thanks for fixing :-)
Tried the Alpha 16. Works :-)