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I have recently installed four computers with Linux. Each one has different monitors, refresh rates, versions, etc. The only constant in all four is the processor with the integrated graphics. Here is a screenshot that I was able to take.

Here

AMD doesn't have official drivers for Linux for this particular processor and I'm not entirely sure about where to go from here. Has anybody else had issues with this?

I have been conducting tests, and I see there is no issue at all with a fresh installation of Ubuntu 18.04.3. I still have a little more testing to do, but I reckon it will start giving me issues as soon as I update my drivers in 18.04.

It turns out I was exactly right. It seems like there are issues with the current kernel with this specific AMD processor. We just ordered a few Nvidia graphics cards because we need to run programs that require specific kernels and we can't afford to waste any more time on this issue. If anybody needs a quick fix and doesn't necessarily care about which kernel version they are using, I found that version 5.0.0-23 works without any issues.

  • I can confirm that older kernels 5.0.0-23 work – mahela007 May 25 at 15:09
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Same problems with Ubuntu 20.04 LTS / Ryzen 3 3200G / Gigabyte B450M S2H / 16GB (2x8GB) DDR4 3200

Workaround 1:

Disable IOMMU in BIOS

Workaround 2:

Add iommu=pt to kernel command line in /etc/default/grub:

sudo nano /etc/default/grub

Edit the line beginging GRUB_CMDLINE_LINUX_DEFAULT to look like this

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=pt"

Update GRUB:

sudo update-grub

Reboot

reboot
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  • 2
    What is iommu? And why does it work? – mahela007 May 25 at 15:07
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    Yeah, is there a thread somewhere in the Ubuntu known errors targeting this. I would like to understand the core issue at play. Today I helped a friend get his system up and running (3400G in a GIGABYTE B450 H) and the only references I've found to this issue is this thread and another with the same symptoms. Is it just an issue with the Kernel shipped with 20.04 ? – Hito_kun Jul 5 at 6:23
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    Sure, iommu + AMD vega is broken completely and nobody today is working on fixing it in kernel. AMD just ignores this issue and don't want to spend developers time. If you want to have stable machine - use Intel + GMA + open source drivers. – puchu Jul 28 at 9:12

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