Intel Linux GPU Driver Patches For 4K HDMI Support
Written by Michael Larabel in Intel on 7 August 2013 at 03:36 PM EDT. 2 Comments
A new set of Linux GPU driver patches have emerged for allowing HDMI 4K support.

The set of new patches were written by Intel's Damien Lespiau and allow for parsing a dark corner of the EDID information for being able to expose the 4K x 2K resolution modes to user-space. These ultra high-resolution modes are supported by the HDMI 1.4 specification.

Besides needing to parse the EDID information for the 4K x 2K modes via the HDMI VICs in the HDMI CEA block, there's a currently queued up Intel i915 DRM driver patch for supporting a 300MHz TMDS clock and an already-merged xf86-video-intel DDX driver patch needed for preserving the EDID blob for the lifetime of an output.

Unfortunately, 4K x 2K support also requires not-yet-merged X.Org Server patches for using the TMDS maximum frequency to check the mode dot clock.

Intel's hardware that support HDMI 4K resolution outputs in conjunction with these various open-source Linux graphics patches is the latest-generation Haswell processors.

More details on these patches can be found on the intel-gfx list.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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