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[stag019 <1295032@xxxxxxxxxxxxxxxxxx>]

Unfortunately, this didn't fix it for me.
`cat /proc/version_signature` return "Ubuntu 3.13.0-18.38lp1295032v201403200948-generic 3.13.6" so the kernel should have installed correctly.
The mode doesn't show up in the System Settings - Displays. I then tried running `cvt 3840 2160 30` and adding that with xrandr, but that caused my monitor to show "Not Supported" (just as it had before).
I can confirm my monitor/graphics card can support the mode using AMD's proprietary drivers.
Any suggestions?

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https://bugs.launchpad.net/bugs/1295032

Title:
  3840x2160 fails with 30Hz with HDMI

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  The radeon graphics card driver assumes any pixel clock speed over
  165000 should be using Dual-Link DVI, although the speeds are possible
  over HDMI as of HDMI 1.3.

  The fix, as well as a link to a more detailed bug report, can be found here:
  https://github.com/torvalds/linux/commit/d03874c881a049a50e12f285077ab1f9fc2686e1

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