Comment 23 for bug 1960633

Impish verification done:

root@impish-vm:~# uname -a
Linux impish-vm 5.13.0-38-generic #43-Ubuntu SMP Fri Mar 18 12:42:26 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
root@impish-vm:~# dpkg -l| grep linux-modules
ii linux-modules-5.13.0-35-generic 5.13.0-35.40 amd64 Linux kernel extra modules for version 5.13.0 on 64 bit x86 SMP
ii linux-modules-5.13.0-38-generic 5.13.0-38.43 amd64 Linux kernel extra modules for version 5.13.0 on 64 bit x86 SMP

No linux-modules-extra package is installed yet, virtio_gpu can be loaded:

root@impish-vm:~# modprobe virtio_gpu
root@impish-vm:~# lsmod | grep virtio_gpu
virtio_gpu 61440 0
virtio_dma_buf 16384 1 virtio_gpu
drm_kms_helper 262144 2 virtio_gpu
drm 561152 3 drm_kms_helper,virtio_gpu

Same for vmwgfx:

root@impish-vm:~# modprobe vmwgfx
root@impish-vm:~# lsmod | grep vmwgfx
vmwgfx 319488 0
ttm 69632 1 vmwgfx
drm_kms_helper 262144 3 vmwgfx,virtio_gpu
drm 561152 5 vmwgfx,drm_kms_helper,virtio_gpu,ttm

And the modules now show in linux-modules-5.13.0-38-generic.list but not in -35-generic:

root@impish-vm:~# grep -E '(virtio-gpu|vmwgfx)\.ko' /var/lib/dpkg/info/linux-modules-5.13.0-3{5,8}-generic.list
/var/lib/dpkg/info/linux-modules-5.13.0-38-generic.list:/lib/modules/5.13.0-38-generic/kernel/drivers/gpu/drm/virtio/virtio-gpu.ko
/var/lib/dpkg/info/linux-modules-5.13.0-38-generic.list:/lib/modules/5.13.0-38-generic/kernel/drivers/gpu/drm/vmwgfx/vmwgfx.ko