Here's my xev log when activating "suspend" from the session menu.
stephenw@stephen-xt2-13:~$ xev -root -event keyboard -display :0.0
KeymapNotify event, serial 17, synthetic NO, window 0x0, keys: 4294967192 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Here's my xev log when activating "suspend" from the session menu.
stephenw@ stephen- xt2-13: ~$ xev -root -event keyboard -display :0.0
KeymapNotify event, serial 17, synthetic NO, window 0x0,
keys: 4294967192 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
KeymapNotify event, serial 17, synthetic NO, window 0x0,
keys: 4294967192 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0