Visual artefacts in a KDE popup boxes and KDE menu with a Mesa 18.3.4 + ATI Park (Cedar (RV 810))

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#1

I have a visual artefacts in a KDE popup boxes and KDE menu with a Mesa 18.3.4 + ATI Park (Cedar (RV 810)):

https://susepaste.org/images/a872c1c2.png

https://susepaste.org/images/d61b9448.png

openSUSE 15.0.
Changing visual renderer in a KDE Settings from OpenGL 2.0 to OpenGL 3.1 wasn’t help.
Previously Mesa (18.0.2 - 18.1 - 18.2 - maybe 18.3.1) works well.
I am using Mesa repository as system: https://download.opensuse.org/repositories/X11:/XOrg/openSUSE_Leap_15.0/x86_64/.

Additional info: it seems to me that Mesa 19.0 will be delayed due to requirements of LLVM:

50s] llvm-config found: NO found ‘6.0.1’ but need ‘>= 7.0.0’

It is better not to update to Mesa 19.0 with a openSUSE 15.0 right now because some files have previous version (18.3.4).

#2

Filed a bug: https://bugzilla.opensuse.org/show_bug.cgi?id=1129359.

#3

Popup box in a LibreOffice Writer:

https://susepaste.org/images/64885838.png
Some popup boxes have artefacts, and some don’t.

#4

Does the problem remain if you switch to the modesetting DDX? https://en.opensuse.org/SDB:Nomodeset:Work_Around_Graphic_Upgrade&_Installation_Obstacles describes switching, and why to do so.

I have two 1002:68f9 HD5450 Cedar running on modesetting DDX in TW and haven’t seen what your Plasma images show.

#5

Problem was solved by a updating to a Mesa 19.0.1 with an aforementioned openSUSE Mesa repository.
All Mesa files in a repo was updated to a 19.0.1, another files (such as xf86-video-ati-19.0.1-lp150.91.1.x86_64) was also updated.