Please use the fake kms driver instead “dtoverlay=vc4-fkms-v3d”
it its known that the full kms driver isnt compatible with tvservice plus other restrictions
EDIT:
Also with the fake KMS you can rotate the display from /boot/config.txt so I suggest @michmich using it as the preferred method in the wiki
Hi guys
Im new to the forum and this project but I have some small experience with the Pis and having the same issue
I think that its related to the video driver, using ‘sudo raspi-config’ and changing the video driver to one of the GL drivers resulted in a much lower cpu load in my case.
Doesn’t matter if you choose full KMS or fake KMS as long as you dont use the legacy non-GL driver.
It took my 4 CPU from full 100% to idle bellow 35%
Im sure someone else with this problem can confirm this