tvservice

pi@raspbmc:~$ tvservice -m CEA
Group CEA has 16 modes:
           mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive 3D:TopBot|SbS-HH
           mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive 3D:TopBot|SbS-HH
           mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive 3D:TopBot|SbS-HH
           mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive 3D:TopBot|SbS-HH
           mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced 3D:TopBot|SbS-HH
           mode 6: 720x480 @ 60Hz 4:3, clock:27MHz x2 interlaced 3D:TopBot|SbS-HH
           mode 7: 720x480 @ 60Hz 16:9, clock:27MHz x2 interlaced 3D:TopBot|SbS-HH
  (prefer) mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive 3D:TopBot|SbS-HH
           mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive 3D:TopBot|SbS-HH
           mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive 3D:TopBot|SbS-HH
           mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive 3D:TopBot|SbS-HH
           mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced 3D:TopBot|SbS-HH
           mode 21: 720x576 @ 50Hz 4:3, clock:27MHz x2 interlaced 3D:TopBot|SbS-HH
           mode 22: 720x576 @ 50Hz 16:9, clock:27MHz x2 interlaced 3D:TopBot|SbS-HH
  (native) mode 31: 1920x1080 @ 50Hz 16:9, clock:148MHz progressive 3D:TopBot|SbS-HH
           mode 32: 1920x1080 @ 24Hz 16:9, clock:74MHz progressive 3D:TopBot|SbS-HH