I just tried Lubuntu using the RPi4 64 Bit image from https://ubuntu.com/download/raspberry-pi on a Raspberry Pi 4 Model B.
:)
I didn't experience the black screen, the USB bug, or any WiFi problems (managed to connect to a WPA2 network easily).
:(
However, I was unable to get the sound to work, even after fiddling with the usercfg.txt file.
After consulting the documentation (https://www.raspberrypi.org/documentation/configuration/config-txt/) I tried various combinations with these config parameters:
hdmi_force_edid_audio=1
hdmi_ignore_edid_audio=1
dtparam=audio=on
Unfortunately I could't get either the 3.5 mm jack or the HDMI audio output to work.
I'm about to try it again from scratch this time with Xubuntu as you'd reported success.
Hopefully I'll be able to report back a confirmation of your results soon.
...
Just finished trying Xubuntu with the same Pi. Initially I had the same problem as lubuntu.
:D
Fortunately after reviewing this link: https://forum.manjaro.org/t/rpi-4-audio-issue/103399 I managed to solve the audio problem.
The key command necessary to fix it was:
sudo amixer cset numid=3 1 numid=3,iface=MIXER,name='PCM Playback Route' ; type=INTEGER,access=rw------,v…
At the moment I have to call it manually after booting, so it is not a perfect fix but I'll probably add it to a boot script if there is no better solution.
My usercfg.txt file contents are:
dtparam=spi=on
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
# Sound settings
dtparam=audio=on
hdmi_ignore_edid_audio=1
I tested it by calling the following command to produce static noise:
aplay -c 2 -f S16_LE -r 44100 /dev/urandom
Best Answer
If you don't want to wrangle patches or wait for them to be released, a workaround may be found in this thread, in one of leggazoid's posts of 10/20:
https://www.raspberrypi.org/forums/viewtopic.php?f=56&t=254649&sid=a82437abaa7e64ee930c7b4040eba764&start=25
Here's the good part, which worked on my 4GB Rpi 4 [edited for clarity]: