AMDGPU DC Display Code Tacks On Another 28 Patches
Written by Michael Larabel in AMD on 11 September 2017 at 07:50 PM EDT. 60 Comments
AMD --
The big undertaking of the rewriting/modernizing of the AMDGPU DRM driver's display code stack has out now another 28 patches.

This AMDGPU DC display stack has been well over one thousand lines of code and in development for years in trying to better synchronize the AMDGPU Direct Rendering Manager's display code with that of their Windows driver. AMDGPU DC is what's needed for HDMI/DP audio on modern Radeon GPUs, HDMI 2.0 support, atomic mode-setting, FreeSync, and other modern display features. More recently, it's now needed for driving physical displays/monitors attached to Radeon Vega graphics cards.

We're still waiting to see if AMDGPU DC will be ready for Linux 4.15 (it's already too late for Linux 4.14) or whether it's back to the long waiting game. We'll see in the next few weeks if Linux 4.15 looks realistic depending upon whether AMD sends out the massive patch series for another round of public review on dri-devel. As it stands now, we haven't seen any indication for or against of whether it's looking like it could be merged for Linux 4.15.

But today we did get 28 more patches to the display code touching around one thousand lines. These latest patches by AMD developers have a number of Raven Ridge fixes, no longer power down clock sources during the atomic check, removes some more abstractions, and fixes display unplugs during S3 or fbcon modes.

More details via this patch series.
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Michael Larabel is the principal author of 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 automated benchmarking software. He can be followed via Twitter or contacted via

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