I am. Just commenting and uncommenting that line. Contents (and I apologise; it's a fairly long-lived thing, so has accumulated some cruft):
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root@rtr-dickonh:~# cat /tftpboot/pi4/config.txt
# For more options and information see
# Some settings may impact device functionality. See link above for details
# Enable audio (loads snd_bcm2835)
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
I've also tested this on an SD card, so it isn't an artifact of netbooting it. I'm attempting to test it on a spare 3B as I type. The initramfs is present to get the NFS root on the bridge device, which it does with a script in nfs-top, which NFS mounts the eventual filesystem, runs 'chroot /root modprobe bridge', does a couple of brctl calls, umount, and continues. As there are no version-specific modules in that, it shouldn't be making any difference.