Amdgpu-experimental on kernel 5.10

Support Kernel
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1

Hello,

I have an unusual setup, but I’m running Manjaro on a computer with a AMD R7 350 with the intent of outputting a VGA signal to a CRT TV to run RetroArch. It took a long time to setup but it works great.

I have to use the amdgpu-experimental drivers to get Vulkan support on this video card, which is very important for performance-related reasons on my setup. This setup works both on kernel 5.4 and on kernel 5.9. I just installed the package, I’ve heard about kernel modules and blacklisting and so on but I have no idea how any of that works to be honest.

I tried switching to kernel 5.10 and what happens is that the operating system does not find the VGA output - xrandr does not even list it, it just shows the other video outputs. As soon as I revert back to 5.9 the output is there.

Now, I might be misremembering, but I think the same happened on 5.9 a while ago, so maybe something changed to make it work now - maybe amdgpu-experimental got updated to support 5.9 and I have to wait for it to be updated for 5.10?

Anyway, my question is, why does this happen? Can I fix it somehow so I can move to kernel 5.10? Do I need to worry about support for my kind of setup dropping? Do I have to always stay one or two kernel versions behind?

It it very strange that the VGA port just disappears when running kernel 5.10. I tried looking this up but I couldn’t find any information.

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amdgpu-experimental package is pretty outdated compared to the amdgpu built into the kernel.

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I’m replying here to note that I kept researching and I finally found relevant information. According to this and this, the 5.10 kernel has the amdgpu drivers supporting my video card - including Vulkan support - but they still do not support analog output.

Since this is a major requirement for me - it’s the main reason I built this computer, actually - then I’ll stick with the previous LTS release, 5.4, until they manage to get analog output working on the new amdgpu support. Possibly indefinitely, which wouldn’t be a problem for me anyway.

Thanks for the reply, realmain. I’ll mark this as the solution to keep this information around for future reference.

4

The simple tweaks it performs is still current. What it does is outlined here: AMDGPU - ArchWikiand_Sea_Islands(CIK)_support

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