Public bug reported:
I tested Kubuntu 26.04 beta by booting it from USB stick on ThinkPad
X9-14 connected to ThinkPad Thunderbolt 4 Workstation dock to which I
have connected three external displays. I should point out that this is
a Lunar lake device so only three displays can be enabled at once.
What happens is that external displays show the glowing boot-time icon
and "kubuntu" text plus Lenovo logo (see the attached photo) and the
laptop's built-in screen displays nothing.
This does not change no matter how long I wait.
If I then disconnect the dock, I see "Try or Install Kubuntu" window on
the laptop's built-in screen, although it is not fullscreen as it
normally is if I boot without being connected to the dock, but quite a
bit smaller with some texts getting clipped. See the second attached
photo.
** Affects: calamares (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Only thing visible before disconnecting the dock"
https://bugs.launchpad.net/bugs/2146726/+attachment/5956705/+files/20260329_183739-s.jpg
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https://bugs.launchpad.net/bugs/2146726
Title:
Installer does not appear on any display if booting while connected to
a dock
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