This also affects me! Here's a simple test case for someone who doesn't own a
hi-dpi screen, but does have a 1920x1080 monitor.
Use this image as your background:
http://i177.photobucket.com/albums/w204/chopin952/Test%20Patterns/Halftone1080p.png
Continue to scale it up and keep looking at the
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
Public bug reported:
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:
