I can make the trackpad non working by doing a hard shutdown (holding the power 
button for about 10s). Following the next reboot, the trackpad will no longer 
be recognised.
The usual steps of rebooting into Windows first and then back into linux is the 
only method I've found to make the trackpad work again.

No other ways will make the trackpad work again (no matter how many
reboot, full shutdown, hard reset etc..). only booting into windows will
make it work again.

somehow the trackpad enters a state that the linux driver module can't
get out of

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  Elantech v4 trackpad no longer working after resuming for hibernate

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