Additional information: when starting a second session xorg.1.log shows: (II) intel(0): [drm] DRM interface version 1.0 (II) intel(0): [drm] drmSetBusid failed (8, pci:0000:00:02.0), Permission denied (EE) intel(0): [dri] DRIScreenInit failed. Disabling DRI. Note that when starting the first session I get: intel(0): [drm] DRM interface version 1.3 Ferry