Okay, received the DSI adapter cable yesterday. Tested with noble .2
server image [1], and noble .2 desktop image [2] on a Pi 5 8GB (older C1
stepping), and oracular server image [3].

The server image didn't show anything *initially* (rainbow screen or
typical initrd output), but midway through systemd starting stuff the
screen came on, showing the console output. Logged in normally with an
attached keyboard, the screen at least appears to work normally.

The desktop image also didn't show anything until the plymouth boot
screen, but then proceeded to work normally through first time setup and
for the desktop itself. That said, the ubiquity installer, the snap-
store and various things do "fall off the bottom" of the display
(clearly not designed for 800x480 resolution!).

To be clear, this is without any modification to the image: config.txt
is stock (so KMS overlay is active), as is cmdline.txt (no specification
of video=), touchscreen is the official 7" DSI connected display,
connected to CSI/DSI port 0, with display's control board powered from
the 5V and GND pins on the Pi's header; I'll attach an image of the
setup.

[1]:
https://cdimage.ubuntu.com/releases/noble/release/ubuntu-24.04.2-preinstalled-
server-arm64+raspi.img.xz

[2]:
https://cdimage.ubuntu.com/releases/noble/release/ubuntu-24.04.2-preinstalled-
desktop-arm64+raspi.img.xz

[3]:
https://cdimage.ubuntu.com/releases/oracular/release/ubuntu-24.10-preinstalled-
server-arm64+raspi.img.xz

** Attachment added: "touchscreen-setup.jpg"
   
https://bugs.launchpad.net/ubuntu/+bug/2102019/+attachment/5865535/+files/touchscreen-setup.jpg

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https://bugs.launchpad.net/bugs/2102019

Title:
  DSI touchscreen fails to display anything on Pi 5 with Ubuntu Server

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