How to disable auto suspend when I close laptop lid?

Edit /etc/systemd/logind.conf and make sure you have,

HandleLidSwitch=ignore

which will make it ignore the lid being closed. (You may need to also undo the other changes you’ve made).

Full details over at the archlinux Wiki.

The man page for logind.conf also has the relevant information,

   HandlePowerKey=, HandleSuspendKey=, HandleHibernateKey=,
   HandleLidSwitch=
       Controls whether logind shall handle the system power and sleep
       keys and the lid switch to trigger actions such as system power-off
       or suspend. Can be one of ignore, poweroff, reboot, halt, kexec,
       suspend, hibernate, hybrid-sleep and lock. If ignore logind will
       never handle these keys. If lock all running sessions will be
       screen locked. Otherwise the specified action will be taken in the
       respective event. Only input devices with the power-switch udev tag
       will be watched for key/lid switch events.  HandlePowerKey=
       defaults to poweroff.  HandleSuspendKey= and HandleLidSwitch=
       default to suspend.  HandleHibernateKey= defaults to hibernate.

Over!