random dots that obscure text in gnome shell when nouveau is used

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I am using generic Ubuntu/20.04, using intel/nouveau as display driver
$ inxi -G
Graphics: Device-1: Intel HD Graphics 530 driver: i915 v: kernel
Device-2: NVIDIA GM107M [GeForce GTX 960M] driver: nouveau v: kernel
Display: x11 server: X.Org 1.20.8 driver: intel,nouveau
resolution: 1920×1080~60Hz, 2560×1440~60Hz
OpenGL: renderer: NV117 v: 4.3 Mesa 20.1.7 – kisak-mesa PPA

$ glxinfo | grep -i “OpenGL”
OpenGL vendor string: nouveau
OpenGL renderer string: NV117
OpenGL core profile version string: 4.3 (Core Profile) Mesa 20.1.7 – kisak-mesa PPA
OpenGL core profile shading language version string: 4.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 4.3 (Compatibility Profile) Mesa 20.1.7 – kisak-mesa PPA
OpenGL shading language version string: 4.30

It works fine for normal uses, except that there are random black/gray dots which obscure text when I activate action-corner (see below, I highlight the problem with yellow marker).

This problem doesn’t exists when I merely using built-in Intel GPU.
Why is my gnome-shell doing this? and is there a way to fix it while keep using the nouveau driver?
Thanks in advance

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Marisa

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