cmdline - a
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BOOT_IMAGE=/vmlinuz-4.1.0-1-amd64 root=/dev/mapper/luca-root ro quiet splash video=HDMI-A-1:1366x768-24@60
cmdline - aBOOT_IMAGE=/vmlinuz-4.1.0-1-amd64 root=/dev/mapper/luca-root ro quiet splash video=HDMI-A-1:1366x768-24@60