Graphical glitches/artifacts on Radeon + Ubuntu 20.04

Following graphical glitches are displayed when using Ubuntu 20.04 with Radeon graphics card [1].
The issue has been likely introduced with e9a16ff1de0a3781d94d20b83a82779dd9150b44 commit (8ff6cd6aaa188a7a34e99cad06a4bfe7dc489b94 didn't have any issue).

![Screenshot_20210307_015055](https://user-images.githubusercontent.com/24700/110253996-75e52580-7f8d-11eb-8c80-a50c936cf1f9.png)
![Screenshot_20210307_015040](https://user-images.githubusercontent.com/24700/110253997-77165280-7f8d-11eb-87cb-b3097f8c639e.png)
![Screenshot_20210307_015026](https://user-images.githubusercontent.com/24700/110253999-77165280-7f8d-11eb-8a10-1d533d08bdda.png)

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Graphical glitches/artifacts on Radeon + Ubuntu 20.04 #25

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Graphical glitches/artifacts on Radeon + Ubuntu 20.04 #25

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