Hi,
i used also the change from vc4-kms-v3d to vc4-fkms-v3d. This change works sucessfully and rotate the display always. The second benefit is, that kodi after this change are more stable. I use the raspberry with the 7 inch Display only for radio and with the vc4-kms-v3d driver the radio stocks the stream in short times. I must then plug off the audio line and plug in after to resolve the stream for shorter minutes.
Please no discussion about the on board audio line, it is not hifi but for me enough.
so long, Obi