Thanks for the new kernel.  I booted it and noted that the right drivers
were now being used ( Accelerated video and glxinfo showing it was using
VC4 rather than the original llvmpipe.   However:

1) On Mate, the Pi locked up within a few seconds of resizing windows
2) On Ubuntu,  it took a few minutes but again the machine locked up after 
using applications. 

Ahead of failures, areas of the screens were flashing/jittering.   Once
locked, only a reboot would gain control of the console.

4GB Pi 4, all 64bit kernels - rock solid without acceleration on the
former kernel,  rock solid WITH acceleration when using Gentoo.

I reverted to the older kernel and the machine is back to being stable,
albeit with out the acceleration.

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https://bugs.launchpad.net/bugs/1850876

Title:
  CONFIG_DRM_V3D is disabled for linux-raspi2 of eoan

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