my ibook video is hanging periodically, requiring reboot,
system log records....
Jul 29 11:26:13 localhost kernel: ATIRadeon::submit_buffer: Overflowed block waiting for FIFO space. Have 5, need 6. RBBM_STATUS 0x80010140. VAP_CNTL_STATUS 0x00000002
Jul 29 11:26:24 localhost kernel: **...