Just tested 3.8.0-rc2 and the problem is still present (switched to tty1 and switched back to X).

mcuelenaere@hp4530s:~$ uname -a
Linux hp4530s 3.8.0-rc2+ #55 SMP Thu Jan 3 17:48:58 CET 2013 x86_64 x86_64 x86_64 GNU/Linux
mcuelenaere@hp4530s:~$ dmesg|tail -n 32
[  187.558865] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  187.558877] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  192.552774] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  192.552784] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  197.546689] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  197.546700] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  202.540605] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  202.540624] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  207.534515] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  207.534532] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  212.528425] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  212.528438] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  217.522339] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  217.522354] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  222.516250] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  222.516267] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  227.511742] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  227.511758] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  232.508152] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  232.508166] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  237.504561] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  237.504574] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  242.500967] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  242.500978] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  247.497380] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  247.497396] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  252.493790] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  252.493806] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  257.490197] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  257.490212] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38
[  262.486606] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[  262.486619] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing CE1C (len 62, WS 0, PS 0) @ 0xCE38