MIME, thank you for reporting this and helping make Ubuntu better.
To reduce this down to to a simple test case, and make it easy to debug, let
the focus be on only the following setup:
Lenovo X250 connected directly via Mini DisplayPort to Dell P2415Q
With this in mind:
+ What is the largest working resolution?
+ What is the least big non-working resolution?
+ After attempting to use the monitor on the least big non-working resolution,
please attach both of the following uncompressed/untarred:
Xorg.0.log
Xorg.0.log.old
** Changed in: xorg (Ubuntu)
Importance: Undecided => Medium
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1547043
Title:
4k Support not working
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