I upgraded my PC from i3 6100 to Ryzen3 3200g. Only on Ubuntu, these issue happen, not in Windows 10. On Firefox, Chromium, wine windows, Clion and other programs.




These issues appear on screenshots too:


  • Seems a graphic card driver issue. I would try sudo ubuntu-drivers autoinstall or in Software & Updates > Aditional Drivers. The output of inxi -SMG -! 31 -y 80 might be useful. – Pablo Bianchi Jul 8 at 0:40
  • @PabloBianchi ´sudo ubuntu-drivers autoinstall´ does installs nothing, and the inxi command has a typo . – EmmanuelMess Jul 8 at 0:45

As explained here the issues are because of the IOMMU, do:

I found a solution here (panariga's "Workaround 2") with which I could keep the IOMMU enabled in the BIOS and without needing any custom drivers. I get a steady 60 fps running glxgears.

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


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  • Welcome to AskUbuntu. Posts about LM are off topic here, as it isn't Ubuntu. askubuntu.com/help/on-topic – mikewhatever Jul 8 at 18:48
  • LM? Whats that? This is about ubuntu 20.04 failing to render correctly. This fixes that, note that the idea was from another poster, but it worked for me, so I wanted to give attribution. – EmmanuelMess Jul 8 at 19:09
  • It is Linux Mint, the distro you use according to our own statement. :~) – mikewhatever Jul 8 at 19:26
  • The quotation ("This is on a Gigabyte B450M DS3H motherboard; running Linux Mint 19.3; kernel 5.3.0-53-generic (Ubuntu 18.04.1 -based); screen at 1920x1200 resolution.") is not mine, it's from another user. Copied it verbatim. – EmmanuelMess Jul 8 at 19:36
  • I see, looks like I need to retract the downvotes. – mikewhatever Jul 8 at 19:51

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