The regression appears to have been resolved as of:
$ uname -sr
Linux 5.4.18-1-MANJARO
As seen in the `uname` output this isn't on Ubuntu, but it's solved on
my end by installing a more recent Linux kernel.
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Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.5/
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https://bugs.launchpad.net/bugs/1861218
Title:
Mini DisplayPort port not recognized on i915 dri
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1861218
Title:
Mini DisplayPort port not recognized on i915 driver for Linux 5.3
Ran the apport-collect 1861218 command, doesn't appear to have changed
the status of the issue.
Changing the issue status back to new.
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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Scratch that, they moved it from drivers/gpu/drm/i915/intel_dp.c to
drivers/gpu/drm/i915/display/intel_dp.c
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https://bugs.launchpad.net/bugs/1861218
Title:
Mini DisplayPort port not rec
The diff is large, about 2000 lines.
Going to try out a few different versions of the driver all the way up
to 5.3.0 to narrow it down.
** Patch added: "Diff of the intel_dp.c file from Linux 5.0 to Linux 5.3"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861218/+attachment/5323630/+f
The DisplayPort stuff appears to have moved
https://elixir.bootlin.com/linux/v5.2.21/source/drivers/gpu/drm/i915/intel_dp.c
https://elixir.bootlin.com/linux/v5.3.18/source/drivers/gpu/drm/i915/intel_dp.c
It not being contained to a single file might make it more difficult to
get a proper diff (I h