0.15.4 White flash at full brightness before boot preset loads + and slow boot on 0.17 nightly 5s delay

[smarticz]

What happened?

When power is cut and restored, LEDs briefly turn on full white at maximum brightness before the boot preset is applied. This happens consistently on every power cycle.
Additionally, on 0.17 nightly the total time from power-on to preset being active is around 7 seconds, compared to noticeably less on 0.15.4.

To Reproduce Bug

Set a boot preset (Apply preset at boot = 1)
Cut power to the controller
Restore power
Observe: LEDs flash full white, then after a delay the correct preset loads

Expected Behavior

LEDs should either stay off or immediately show the boot preset state - no white flash.

Install Method

Binary from WLED.me

What version of WLED?

0.15.4

Which microcontroller/board are you seeing the problem on?

ESP32 Gledpto Elite 4-Channel EXMU

Relevant log/trace output

Anything else?

On the original Gledopto stock firmware this behavior did not occur. Does Gledopto ship a custom WLED build with different boot initialization? If so, what is different?
Controller is connected via WiFi, but the hardware is an Ethernet-capable Gledopto model.
Possibly related to #3196 and #5446.

WLED version: 0.15.4 (white flash), 0.17 nightly (white flash + ~7s boot delay)
Board: Gledopto ESP32 with Ethernet (GL-C-6xxWL series), used over WiFi

Code of Conduct

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[DedeHai]

you'd need to ask gledopto on changes to bootup code. the white flash is a property of the LEDs and related to relay switching. the 7s bootup is not something I ever observed so not sure what is going on there

[andyfrei]

I experience the same white flush on boot up since v0.15.2 ever since, hasn't been with 0.15.1 I think, at least not with 0.15.0. controller is https://www.athom.tech/blank-1/wled-esp32-music-addressable-led-strip-controller

it is still present with 0.15.4

[DedeHai]

like I said, the white flash is coming from the strip itself, its not something the software has much control of. it depends on timing of the relay switching, the relay type, the powersupply, the capacitors used etc. I have some code that mitigates it but it is highly hardware dependent on whether it helps or not.