Plymouth script module based themes broken

[devshanky]

Facing issues with Plymouth script based themes on RaspiOS 64-bit arm64 updated to latest firmware. It may randomly show up during boot and sometimes it flashes and disappears. Mostly observed when the screen resolution changes from 720p to 1080p or vice-versa.

2-step throbber based themes works fine.

-R

[devshanky]

Always works with hdmi_safe=1.

It was working reliably on 5.4.79-v8+ without hdmi_safe=1.

-R

[popcornmix]

Does switching

dtoverlay=vc4-fkms-v3d

to

dtoverlay=vc4-kms-v3d

in config.txt help?

[devshanky]

No. Tried both.

-R

[devshanky]

I have a feeling it may have to do with initramfs.

I am able to consistently see the plymouth screens if I do update-initramfs -c -k $(uname -r) after a change in screen resolution. However I lose it again on subsequent reboot. I am unable to understand this behavior. It is not desirable to update-initramfs after change in screen resolution.

I do xrandr -s for immediate effect and also update config.txt with hdmi_mode and hdmi_group with appropriate values.

-R

ps.
I also have initramfs initrd.img-5.4.79-v8+ followkernel in config.txt.

[devshanky]

@popcornmix WELL WELL WELL....

I commented out dtoverlay=vc4-fkms-v3d and now the things are back to normal.

I compared output of dmesg from both the scenarios when things work good and when it doesn't with dtoverlay=vc4-fkms-v3d enabled.

Looks like a timing issue with loading overlay drm driver. Please look a the image attached with this message.

Unfortunately, I will not be able to use kms or fkms driver with this update.
This also means I will not be able to xrandr to change the settings on the fly...
-R