Appreciate the updates and work-around.
I urge you to file bug reports on this issue so it can get visibility and so that the developers can get the additional information needed to work on the issue.
Thanks
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Sure, glad to help. Here is the bug report:
https://bugs.launchpad.net/ubuntu/+source/marco/+bug/1876480
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Thanks for your info and all your hard work. Simple users like me go through some strange workarounds. I ended up switching monitors with my other machine to solve the issue. I will end up switching back in the near future because I prefer to work on the 16:10 screen. It fits my XP-Pen graphics tablet's aspect ratio.
I'm glad that it's a known bug and not my monitor or GPU. When I do attempt to switch I'll let you all know how it went.
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Please see this bug report: https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues/10
I have a Lenovo Ideapad 130-15AST. So as not to bloat the thread I put the output of lshw in pastebin here:
https://pastebin.com/NMBigV4G
The above picture is what the MATE 20.04 live USB boots to.
I first upgraded from 18.04 using do-release-upgrade. The result looked like the photo as well.
Then I reinstalled 18.04, upgraded to 19.10, which looked and performed normally. I then upgraded the 19.10 install to 20.04 with the same result as the photo.
I also tried with a different flash drive just to rule that out.
Then I made the live USB of the 20.04 image and booted it to what you see above.
I made a live USB of both Stock Ubuntu and Kubuntu 20.04 and both worked just fine.
Until I tried the other two flavors I was thinking it was system specific, but after they worked normally it seems to be a MATE specific issue with this system.
It appears to be only a display problem. The DE is completely unusable with the mouse, but I can launch a terminal and run commands, although the terminal is just as distorted as the photo above, so you can't see what you are typing or the resulting output.
Is there anything else I can try to troubleshoot this issue to determine if it's a problem with that laptop or something with MATE itself on this hardware configuration?
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Same problem here on lenovo v110-15ast. Amd a6-9200 cpu and r4 graphic. Same issue on Xubuntu 20.04.
It's fine on mate & xubuntu 19.10 and other 20.04 ubuntu flavours (kde, budgie, gnome)
I went ahead and filed a bug report on this.
https://bugs.launchpad.net/ubuntu-mate/+bug/1875944
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@CerebralNomad Try this work around in the terminal:
xfconf-query -c xfwm4 -p /general/vblank_mode -t string -s "glx" --create
The xorg upstream fix is slated to be added in an SRU.
However, at this time it appears that this will be made available in the 20.04.1 release. 
This issue also effects Xubuntu and Ubuntu Studio.
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Do you have to typ this work arround after every reboot or once?
The settings should be retained.
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I solved my issue by navigating through the garbled GUI, like a point and click pro.
I hit the super key, typed in tweak, hit enter, then carefully made it down to "windows" tab, then selected Marco(No Compositor). It is possible to do it even with the stair step effect if you carefully estimate the location of the pointer.
Problem solved instantly.
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the terminal command didn't work for me
Had this before, just wanted to report that the work arround didn't work for me
Unfortunately, none of the regular QA or Dev Team members has an AMD GPU to test this.
Thus we are forced to rely on user reports and reports from other flavors to help troubleshoot.
We appreciate all the reports and troubleshooting steps everyone is providing.
I'm having the same issue, my computer, a laptop Lenovo is unusable due to this problem.
Is there any way to fix it? : (
After a few tries (moving around the settings) this worked for me. Thanks!
Has this not been fixed? Looks like its back to regular ubuntu for me.
No, I have had the same problem installing Ubuntu Mate today.
The bug is still around.
The solution has been to select Marco (No Compositor) as starseed-pl suggested on his post from 8 may.
Isn't it a pity? A brand new system and no compostion available...
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