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banana-pi

How can I change the monitor resolution on a Banana Pro?

I'd like to change the resolution of my monitor, connected via HDMI from a Banana Pro.

I get a list of available monitor resolutions by the following command:

cat /sys/class/graphics/fb0/modes

and then pick one of them that I want to use, say:

D:1280x720p-50

(1280x720p, 50 Hz refresh rate)

I've edited the /etc/rc.local file to include

echo D:1280x720p-50 > /sys/class/graphics/fb0/mode

Saved the file, rebooted - no change from the default resolution.

Solution

  • I figured this out with a bit of tinkering.

    Remove the SD card with the linux image on it, and stick it into a computer that can read it.

    Open up the uEnv.txt file to edit it.

    Change this

    disp.screen0_output_mode=EDID:1280x720p50

    to this

    disp.screen0_output_mode=1280x720p50

    The EDID argument tells the kernel to try and use the monitor's settings to determine a resolution. Removing it forces your selected resolution to be used.

    For some reason, this defaulted to a really low resolution for my screen with the Banana Pro.