История изменений

DRM drivers also add options to enable or disable outputs:

'e' will force the display to be enabled, i.e. it will override the detection
if a display is connected. 'D' will force the display to be enabled and use
digital output. This is useful for outputs that have both analog and digital
signals (e.g. HDMI and DVI-I). For other outputs it behaves like 'e'. If 'd'
is specified the output is disabled.


You can additionally specify which output the options matches to.
To force the VGA output to be enabled and drive a specific mode say:
    video=VGA-1:1280x1024@60me

Specifying the option multiple times for different ports is possible, e.g.:
    video=LVDS-1:d video=HDMI-1:D

Отсюда

You can additionally specify which output the options matches to.
To force the VGA output to be enabled and drive a specific mode say:
    video=VGA-1:1280x1024@60me

Specifying the option multiple times for different ports is possible, e.g.:
    video=LVDS-1:d video=HDMI-1:D

Отсюда