Press the keys CTRL + ALT + t to open a terminal (crosh). Type shell and hit the ENTER key to open a command line shell.
crosh> shell
chronos@localhost / $
Find the module ID at the lines containing "bad trackpad package". In the following example, the ID is bcm5974.
$ dmesg
...
[ 364.799139] bcm5974: bad trackpad package, length: 8
Remove and reload the module with the rmmod command and the modprobe command respectively.
$ sudo rmmod bcm5974
$ sudo modprobe bcm5974
See also: