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XPS 15 9550, open windows resizing after wake / lid open, igfxpers.exe?

For a while, shrinking of windows, apparently to fit a somewhat smaller screen resolution than the default 4K, has been bugging me now and then. At first I thought this had sth to do with the other wake-from-sleep/hibernation related woes. But lately I've seen it in action upon just reopening the lid, without any form of sleep involved. Did anybody else notice such window resizing after closing and then reopening the lid?

After a bit of googling I guess this is likely caused by the Intel video driver, more specifically igfxpers.exe. Any thoughts about disabling it? Any other idea?

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