Open-Source AMD Polaris Audio Support Isn't Coming Until DAL Lands
Written by Michael Larabel in Radeon on 9 August 2016 at 09:14 AM EDT. 47 Comments
RADEON --
Just as a quick word of warning, the open-source AMD Linux driver stack won't be supporting HDMI/DP audio with the new Radeon RX 460/470/480 "Polaris" graphics cards until its massive DAL code-base is merged.

Alex Deucher of AMD has confirmed via a bug report that Polaris audio support is only supported by the DAL display abstraction code that isn't yet mainlined.

DAL is a massive chunk of code that received some early criticism and is still being cleaned up for mainline acceptance. DAL's code is originally derived in a large part from the proprietary AMD driver stack. DAL will allow more features to the AMDGPU driver, such as FreeSync support to be implemented over DAL and proper HDMI 2.0 support. Polaris audio is another feature depending upon DAL.


The DAL code didn't get mainlined for Linux 4.8 (nor was it proposed for merging during this cycle) so now this functionality won't be present until at least the Linux 4.9 kernel. Unfortunately, Linux 4.9 makes it out of reach for the stock kernel of Ubuntu 16.10 and Fedora 25. Linux 4.9 will be released late in the year.

For the time being there are the options of this branched code that has the DAL support present in a 4.6-based kernel or using the AMDGPU-PRO driver with its out-of-tree module.

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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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