Sometimes my mouse is stuck after a resume on Ubuntu, this fixes it.

mousey.c

/* replace the filename with appropriate usb device info for your computer. get device info from lsusb. */

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <linux/usbdevice_fs.h>
#include <sys/types.h>
#include <unistd.h>

int main(void)
{
    const char *filename = "/dev/bus/usb/005/002";
    int fd;

    seteuid(0);
    fd = open(filename, O_WRONLY);
    ioctl(fd, USBDEVFS_RESET, 0);
    close(fd);
    return 0;
}