There is the option of omitting it and running with the older framebuffer API, but you then have no 3D acceleration available at all as that is part of what that overlay enables.
If it works on Raspbian and Gentoo, then it sounds like it's only an Ubuntu issue. What version of Ubuntu are you trying to run?gilius2k15 wrote: ↑Mon Aug 05, 2019 4:18 pmWe've been trying to interchange 64-bit kernels based on the Pi4 that work fine in Raspbian (32-bit userland) and Gentoo (64-bit userland) - but when replacing the Ubuntu kernel for Ubuntu 64-bit the display becomes like a black screen with a white mouse cursor - or can look very messed up instead. Only upon disabling VC4 does the Ubuntu desktop GUIs work.
On what basis?
Must mesa be >=19.1.0 only for RPi 4 or for all RPi versions?
Earlier Pis on which you run vc4-fkms-v3d or vc4-kms-v3d may work on earlier versions of mesa as they are using the vc4 driver for the 3D drawing side. Pi4 is using the v3d driver, and the last few fixes for making it usable were fairly late in the process.