RADEON_DAC_FORCE_DATA_SHIFT
(0xec << RADEON_DAC_FORCE_DATA_SHIFT));
tmp |= (0x1b6 << RADEON_DAC_FORCE_DATA_SHIFT);
tmp |= (0x180 << RADEON_DAC_FORCE_DATA_SHIFT);
tmp |= (0x1b6 << RADEON_DAC_FORCE_DATA_SHIFT);
tmp |= (0x1ac << RADEON_DAC_FORCE_DATA_SHIFT);
tmp |= (0x180 << RADEON_DAC_FORCE_DATA_SHIFT);