Please update the bug description to clarify if the machine with the
faulty HDMI port is the one with a capped resolution.
I experienced a similar issue recently. In my case it was a poor
connection on the HDMI plug limiting the available resolutions. The fix
for me was to plug in a fresh HDMI cable that cleaned out the socket and
then gave a better connection. Full resolution returned after that.
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
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https://bugs.launchpad.net/bugs/1644007
Title:
Intel HD Graphics 5500 Drivers Cap Resolution at 1366x768 and don't
support video out for external displays
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