Flicker free boot in thinkpad t-530/thinkpad helix?

Hi, I noticed that in some laptops, flicker free boot shows up a lenovo/hp/dell logo, but in others -thinkpad t530, thinkpad helix, from 2013- it shows only the spinner… Is there any way to make it work in this machines or is something thtat works in new models? Both machines are in UEFI-secure boot mode, but they have ivy bridge processors…, Is flicker free boot targeted towards new models only?

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Maybe, I’m not aware of any novelty, because it is not supposed to work with amd/nvidia graphic cards?
Edit: but I’m not sure.

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Perhaps you should check the BIOS/EFI fastboot setting.

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Here you can find a detailed FAQ: https://hansdegoede.livejournal.com/20632.html

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Thanks, i’ve checked it. It’s strange: i do have a
/sys/firmware/efi/efivars
but i don’t have any
/sys/firmware/acpi/bgrt*
the system is in uefi mode, CSM is disabled from bios settings and there is no vga display, only “thinkpad lcd”.
I’ve added the i915.fastboot parameter to the kernel, but i see always a black screen between the manufacturer logo and the spinner.
any clue?