Hybrid graphics switching isn't supported in ubuntu yet.
Generally with these systems the HDMI is wired to the nvidia card, not
Intel, so it simply won't work. You'd have to blacklist i915 and only
run nvidia if you need the hdmi.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/879879
Title:
HDMI out not working (Dell XPS L401X)
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