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Is there support for USB C DP alt mode via Thunderbolt?
(lemmy.world)
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So the system thinks it's enabled? Can you move the mouse cursor to it?
Exactly. No I can't move my mouse to the external monitor.
Do you mean that it stays on the internal display, or that it doesn't show up on the external one?
Or to ask it differently, can you move a window where the monitor should be?
The mouse stays on the internal display.
Okay, then the driver doesn't allow Plasma to turn it on for some reason. You can report that at https://gitlab.freedesktop.org/drm/i915/kernel/-/issues, maybe someone from Intel can help.