Frame Buffer Set on Banana Pi

When you plug the HDMI of Banana Pi running Bananian to low resolution TV or Monitor, you won't get proper display.  To correct this use the frame buffer setting,

sudo apt-get install fbset

Replace the /etc/fb.modes, fill it with these lines:
mode "640x480-60"
    # D: 25.200 MHz, H: 31.500 kHz, V: 60.001 Hz
        geometry 640 480 640 960 32
        timings 39682 48 16 33 10 96 2
        rgba 8/16,8/8,8/0,8/24
endmode

mode "768x576-75"
    # D: 49.188 MHz, H: 46.580 kHz, V: 75.008 Hz
    geometry 768 576 768 1152 32
    timings 20330 128 32 32 8 128 5
    accel true
    rgba 8/16,8/8,8/0,8/24
endmode

mode "800x600-60"
    # D: 40.000 MHz, H: 37.879 kHz, V: 60.317 Hz
    geometry 800 600 800 1200 32
    timings 25000 88 40 23 1 128 4
    hsync high
    vsync high
    accel true
    rgba 8/16,8/8,8/0,8/24
endmode

mode "1024x768-60"
    # D: 65.00 MHz, H: 48.363 kHz, V: 60.00 Hz
    geometry 1024 768 1024 768 32
    timings 15385 160 24 29 3 136 6
endmode

mode "1152x864-60"
    # D: 80.0 MHz, H: 54.945 kHz, V: 59.98 Hz
    geometry 1152 864 1152 864 32
    timings 12500 128 64 41 6 112 5
    hsync high
    vsync high
endmode

mode "1280x1024-60"
    # D: 108.00 MHz, H: 63.981 kHz, V: 60.02 Hz
    geometry 1280 1024 1280 1024 32
    timings 9260 248 48 38 1 112 3
    hsync high
    vsync high
endmode

mode "1600x1200-60"
    # D: 156.00 MHz, H: 76.200 kHz, V: 60.00 Hz
    geometry 1600 1200 1600 1200 32
    timings 6411 256 32 52 10 160 8
endmode

mode "1920x1080-60"
    # D: 148.500 MHz, H: 67.500 kHz, V: 60.000 Hz
    geometry 1920 1080 1920 2160 32
    timings 6734 148 88 36 4 44 5
    hsync high
    vsync high
    rgba 8/16,8/8,8/0,8/24
endmode

Execute the fbset with one of those setting, as example, i'm using old 1024x768 monitor with HDMI to VGA converter
fbset 1024x768-50

That's all
Reff: http://www.cubieforums.com/index.php/topic,50.0.html