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After upgrading from Kubuntu 18.04 to 20.04 (with kernel 5.4.0-28-generic) on my AMD Ryzen 3 3200G with Radeon Vega Graphics. I started to experience problems with my display:

On the plus side, the desktop effects feels smoother, however my display blanks out from time to time, as well as leaving some artifacts after interactions with some plasmoids.

This seems to go away when I boot to the old kernel 4.15.0-99-generic from the installation of 18.04.

So my questions are:

  1. Are there known issues with the Ryzen 3 3200G with Radeon Vega Graphics with Kernel 5.4.0-28-generic as shipped by Ubuntu 20.04 and kwin 5.18.4?

  2. Are there any settings to kwin to make it more stable, even at the cost of losing some desktop effects?

Chen Levy
  • 121

1 Answers1

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It seems that it is not the kernel itself but the boot parameters passed to that kernel.

So the solution that worked for me was:

  1. Edit /etc/default/grub and add nomodeset) to the end of the GRUB_CMDLINE_LINUX_DEFAULT="..." line, as shown by this diff:

    --- a/etc/default/grub
+++ b/etc/default/grub
@@ -7,7 +7,7 @@
 GRUB_TIMEOUT_STYLE=hidden
 GRUB_TIMEOUT=10
 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
-GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
+GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
 GRUB_CMDLINE_LINUX=""

    Uncomment to enable BadRAM filtering, modify to suit your needs

  2. Generate the grub configuration for its templates:

     sudo update-grub

  3. Reboot.

Update:

After adding nomodeset I noticed that:

However the solution suggested below by Andrew Richards did not work for me.

Chen Levy
  • 121
  • 1
    (moderator: Please convert this answer into a comment, not enough reputation to do so) This solution didn't work for me, but please see this solution which did (same steps, but different settings for the GRUB_CMDLINE_LINUX_DEFAULT line. – Andrew Richards Jun 09 '20 at 10:37