Raspberry Pi – Something About /boot/config.txt

Date:  Mar 9, 2020

This is my /boot/config.txt looks like.

But there are few lines, we want to know how to change the value so that the screen works well even in both 3.5″ LCD screen, or the VNC display.

Screenshot 2020-03-09 at 10.00.38 PM.png

First, I remove all the hdmi_group and hdmi_mode here.

I added in hdmi_ignore_edid=0xa5000080 here.

This line is important.

Screenshot 2020-03-09 at 10.03.05 PM.png

This is because of the following.

Screenshot 2020-03-09 at 10.04.08 PM.png

You got the above info from here.

https://www.raspberrypi.org/documentation/configuration/config-txt/video.md#Custom%20Mode

Next, under the [all] section… I added in the hdmi_group and hdmi_mode here.  There are many many modes.

Screenshot 2020-03-09 at 10.05.28 PM.png

We choose DMT group.

hdmi_group=2

Screenshot 2020-03-09 at 10.06.18 PM.png

If you choose the CEA mode…

Screenshot 2020-03-09 at 10.07.09 PM.png

Screenshot 2020-03-09 at 10.08.00 PM.png

Screenshot 2020-03-09 at 10.08.48 PM.png

If you choose DMT which is

hdmi_group=2

Screenshot 2020-03-09 at 10.09.25 PM.png

Screenshot 2020-03-09 at 10.09.43 PM.png

Screenshot 2020-03-09 at 10.10.12 PM.png

So, all you need to do is choose the mode.  Choose something you like.

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