Same here with an HD6950.

Here is the output i have from the terminal:

New UI mode "Game" set in 0 ms
VideoImpl::ReadAndDecodeFrame: skipped frames: 99
EE r600_shader.c:2494 r600_shader_from_tgsi - GPR limit exceeded - shader
requires 132 registers
EE r600_shader.c:158 r600_pipe_shader_create -translation from TGSI failed !
EE r600_state_common.c:758 r600_shader_select - Failed to build shader variant
(type=1) -12
Map changed to "Maps/Isla grande lago T1". Lua memory in use: 21690 KB.