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[Bug 1295032] Re: 3840x2160 fails with 30Hz with HDMI

 

This patch is included in the upstream 3.13.7 kernel.  Ubuntu 14.04
"Trusty Tahr" is now based on the 3.13.7 kernel.  Can you update and
retest?

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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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