@Ian,

"rock solid WITH acceleration when using Gentoo", could you please tell
me what is the kernel version for Gentoo? Or could you paste the output
of 'uname -a' under Gentoo?

I tested the branch rpi-5.3.y of upstream kernel
(https://github.com/raspberrypi/linux.git), the v3d driver is better
now, but still has some problems. So I guess the Gentoo uses 4.19
kernel?

BTW, we have another bug to track this issue
https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1852035,
from the comment #14 and #15 of that bug, we could see even applying the
latest patches of v3d, the driver still has some problems.

So we need to disable the driver v3d in the kernel until the branch
rpi-5.3.y has the perfect fix for this driver.

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

Title:
  CONFIG_DRM_V3D is disabled for linux-raspi2 of eoan

Status in linux-raspi2 package in Ubuntu:
  Confirmed
Status in linux-raspi2 source package in Eoan:
  Fix Committed

Bug description:
  We enabled DRM_VC4 in the linux-raspi2 of eoan, but disabled the
  DRM_V3D.

  In fact the DRM_V3D is crucial for graphical applications (such as
  ubuntu-desktop :) as it removes the graphical overhead from the cpu to
  the gpu, making the applications work much faster.

  Please refer to https://bugs.launchpad.net/ubuntu/+source/linux-
  raspi2/+bug/1848703/comments/32

  
  [Impact]
  Users reported that we should enable the DRM_V3D, then the GPU will
  be fully used when running "ubuntu-desktop"

  [Fix]
  Enable the DRM_V3D, the v3d.ko will be built

  [Test Case]
  Users already tested it, it worked well.
  
https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1848703/comments/36

  [Regression Risk]
  Low, I already did building test for arm64 and armhf, all passed.
  And uers already tested the kernel module, it worked as expected.

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