AMD Promotes Navi 14 Linux Support Out Of "Experimental" + Fixes For Raven Ridge
Written by Michael Larabel in Radeon on 21 November 2019 at 02:20 AM EST. Add A Comment
RADEON --
With the initial Navi 14 support to be found in the Linux 5.4 kernel releasing this weekend the GPU ASIC (along with Navi 12) have been marked as experimental and thus not enabled by default unless passing a special module parameter to the kernel. But now at the last minute this support has been deemed non-experimental for Navi 14.

After the original Navi 12/14 open-source driver support was published, it was then marked as experimental. Under that experimental state, the hardware initialization only happens if amdgpu.exp_hw_support=1 is set as a parameter for the AMDGPU kernel driver.

But now just days away from the Linux 5.4.0 kernel release, an AMDGPU fixes pull request was sent in that removes the experimental flag for Navi 14. The commit message for the change simply states, "5.4 and newer works fine with navi14."

Navi 14 is at least in part the forthcoming Radeon RX 5500 series. With those lower-tier Navi cards shipping this quarter, it's great to see Linux 5.4 will be ready for when those retail cards (and mobile GPU) arrive.

Navi 12 meanwhile is still marked as experimental for Linux 5.4.

Other changes in this "fixes" pull request include two stability regression fixes for Raven Ridge APUs, which end up disabling S/G and GFXOFF for those Zen+Vega APUs. S/G apparently is still causing problems when IOMMU is enabled for some systems while the GFXOFF power-savings functionality still also has its own set of problems with select board/firmware combinations.
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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 20,000 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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