VNC into login screen (instead of user's desktop)

I'm using RasPi B+ with Raspian from Noobs, lightdm, lxde

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There are various descriptions out there on how to set up TightVNC on a RasPi, most of them VNC into root's desktop or another pre-specified user's desktop. I would like to see the lightdm login screen instead when connecting via VNC. Reasons:

• flexibility: not being limited to a specific user (especially not root)


• functionality: those recipes force a user, then use startx or the like, which gives you a slightly crippled lxde session (no permission to mount USB devices, no reboot/shutdown).

I was able to set something like this up using x11vnc, using recipes like:

• tightvncserver - show the same screen on hdmi and vncclient


• http://roger.steneteg.org/245/start-vnc-together-with-lightdm/

This starts x11vnc together with lightdm and mirrors the main desktop over to VNC. Drawbacks:

• performance: x11vnc is considerably slower than tightvnc. I've played with the x11vnc flags for a day, but have to reduce quality a lot to get somewhere near the performance of tightvnc.


• boot performance: having to boot into lightdm instead of command line adds about 10secs on boot time.


• CPU load: x11vnc constantly uses about 15-30% CPU

Is there a way to get TightVNC to load the lightdm login screen? I reckon I need to modify the line /usr/bin/lxsession -s LXDE & in ~/.vnc/xstartup, but unsure how. Any help appreciated!