I have the same issue on 2 monitors and Nvidia 2080ti in Linux Mint 19.3. That solution above solves it.
Anyone else get flickering desktop backgrounds and windows periodically on NVIDIA cards in Cinnamon?
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Re: Anyone else get flickering desktop backgrounds and windows periodically on NVIDIA cards in Cinnamon?
LinuxMint 20 resolved the flickering black boxes around windows (and sometimes the windows themselves) on my second display.
- adam_hardy42
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