Hi, 
I'm running arch linux (updated on weekly basis with the official arch packages),
using gnome 3.12.2 (and loving it), but there is one small issue, my screen never goes "blank" when idle.

I have defined in gnome power settings, under "power savings", I have selected 5 minutes, tried to played a little with the numbers, noticed that they are updating under:
$ gsettings get org.gnome.desktop.session idle-delay
uint32 300

but my screen never goes blank.

I'm have tried to play with xscreensaver, but as I understand this is not the mechanism that gnome uses to blank the screen (I eventually just removed the xscreesaver package),

moved to gnome-screensaver, but as I understand this is the legacy, now gnome has some other way to "blank" the screen without the gnome-screensaver packages.

I suspect that it's related to the fact that I'm using lightdm and not gdm, but I'm not sure since there is not enough documentation for me to debug the issue.

So currently I'm stuck with screen that not going "blank", and I know that at least one other user with gnome suffers from the same issue.

Please assist in debugging/resolving the issue.


Just in case I'm supplying logs(don't know if any of them will be valuable):
lightdm: http://www.datafilehost.com/d/1da6b16a
xorg: http://www.datafilehost.com/d/0b23e6fd
xsession-errors and xsession-errors.old are empty so none there...

Thanks.