Mario, could you test the fix on 26.10 with the UP3218K? The build is
24.004.60+git20250831.4a3c171d-0ubuntu10.1~ppa1 in ppa:phantomba/verification,
with the same patches as the 26.04 build tested in comment #2.
sudo add-apt-repository ppa:phantomba/verification
sudo apt install $(dpkg-query -W -f='${binary:Package}\n' | grep -E
'^(lib)?plymouth')
sudo update-initramfs -u
Then boot with plymouth.debug and run the Test Plan from the description.
Expected: one logo and spinner at boot and shutdown, and
"Creating 7680x4320 logical head for TILE group" in
/var/log/plymouth-debug.log.
The splash stays low-resolution until the GPU driver loads (comment #6),
so please judge it after that.
Please post the apt policy plymouth output, the GPU, and the results.
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https://bugs.launchpad.net/bugs/2167376
Title:
Plymouth doesn't handle tiled displays properly
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