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https://bugs.launchpad.net/bugs/1849484
Title:
[X1 Carbon 7, i915, HDMI] Ultra-wide monitor recognized properly when
plugged
Hmm, it shouldn't be a multi-stream problem. It looks like you only need
HDMI v1.3 to drive that resolution and your laptop supports HDMI 1.4b
already.
So mainly I suspect a bad HDMI cable, bad HDMI adaptor, or just faulty
EDID data coming from the monitor.
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