Noticed something quite weird when using the default kernel module
(radeon).

- when running glxgears, it starts running normally, but stalls quickly. If I 
active movement (hightling a part of my terminal and moving the mouse around 
simultaneously), it seems to skyrocket and run normally. Until I stop moving my 
mouse (which highlightning a piece of the terminal), then it stops running 
again (5FPS, not being re-drawn).
- When using Firefox, it appears to 'stall' regularly. But if I hide the 
window, it seems like the page is being processed (for example when visiting a 
site) and when I show the window again, it is updated. This does not happen 
when the window is being showed, it just appears to hang.

Additional piece of info: I have a 4K 60hz monitor.

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https://bugs.launchpad.net/bugs/1975566

Title:
  radeon / amdgpu bad performance or panics

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