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HDMI display does not display after installing FBCP driver

From LCD wiki

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Phenomenon

For the following products:

MHS-3.5inch RPi Display

MHS-4.0inch Display-B

Following the steps of the wiki page to install the driver supporting FPCP, the above display can display normally.

However, the hdmi-connected monitor displays nothing or is prompted "input not supported", etc

Analysis

Since the default output resolution of the driver installed in the above products is 480*320,

but many traditional HDMI displays do not support HDMI input signal lower than 640*480,

the HDMI display cannot display normally or even without display.

Solution

  • Open the "config. txt" file in the TF root directory,
  • Find the line at the end of the file
hdmi_cvt 480 320 60 6 0 0 0
  • Change the value of 480*320 to 640*480, 800*480 or the higher resolution (note the space),
  • For example: change to 800*480 resolution
hdmi_cvt 800 480 60 6 0 0 0
  • Save and safely pop up TF, insert raspberry pie and restart.