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Built-in screen blinking in ubuntu Ubuntu 20.04.3 LTS after recent update

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I have a problem with blinking screen (suddenly goes dark for few ms every 2-3 seconds) after recent updates. It's not present all the time. Scenarios when it happens: -after unplugging external monitor, -after waking up from suspension, -always in user choice menu after boot.

I have an AMD + NVidia

01:00.0 VGA compatible controller: NVIDIA Corporation Device 1f95 (rev a1)
    Subsystem: Lenovo Device 3a44
    Kernel driver in use: nvidia

05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev c6)
    Subsystem: Lenovo Renoir
    Kernel driver in use: amdgpu

It happens only when NVIDIA Prime is set to ON-DEMAND.

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