Touchpad moves ok but no click in Big Sur

Hi,

The touchpad in my Lenovo Legion Y7000P worked well in Catalina. After upgrade to Big Sur,

The touchpad can move well, but no click. I enabled 'Tap to click' and 'Secondary click'. I tapped with 1 finger, 2 fingers, on different touchpad area, no click.

The other weird thing is that if I do not touch touchpad, the Logitech wireless USB mouse works well (move around, click ok). But once I touch the touchpad, mouse left click will not work, right click is fine.

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Any suggestions on what is the root cause and possible fix?

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Thanks.