But in version 1.55 has encountered a problem: when the DAC driver is ON - display is lost and don’t detect .
Only helped to edit the file
/boot/config.txt
gpu_mem=16
hdmi_drive=2
dtoverlay=hifiberry-dac
device_tree=bcm2708-rpi-b.dtb
device_tree_param=i2c1=on
device_tree_param=spi=on