[LightDM] antialiasing with lightdm

[Louis-David Mitterrand]

Hi,

On my debian testing system after switching from gdm3 to lightdm I
noticed a quality degradation in xterm font rendering:

System started with lightdm:

http://titus.apartia.fr/stuff/lightdm_fonts.png

System started with gdm3:

http://titus.apartia.fr/stuff/gdm_fonts.png

In the second screenshot font are clearer, it's especially visible in
the colored 'ls' output.

Is there a way to get the same font rendering quality in lightdm?

Thanks,