I tried on kernel 4.13. that's,

add "mt7601u.dyndbg=+p" into grub.cfg, so the lines are :
menuentry {
     .....
     linux   /boot/vmlinuz-4.13.0-041300-generic 
root=UUID=f4f53ad3-0e42-46e5-a9f2-679314bf74bf ro  quiet splash $vt_handoff 
mt7601u.dyndbg=+p
     initrd  /boot/initrd.img-4.13.0-041300-generic
}
reboot,

$ cat /proc/cmdline       // the output shows that param is add 
BOOT_IMAGE=/boot/vmlinuz-4.13.0-041300-generic 
root=UUID=f4f53ad3-0e42-46e5-a9f2-679314bf74bf ro quiet splash vt.handoff=7 
mt7601u.dyndbg=+p

It seems that no much differences in the dmesg log.
Please see the attached kernel-param.txt

BTW, I also tried to add "mt7601u.dyndbg=+p" in the /etc/sysctl.conf,
reboot, however, it seems this doesn't have effect because "sudo sysctl
-a|grep mt" doesn't show the parameter.

Regards

** Attachment added: "kernel-param.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1716301/+attachment/4960564/+files/kernel-param.txt

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Title:
  wifi driver: mt7601u not work on 16.04

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