Want to interface HDMI display to Rpi3 & rpi zero boards.

[titusece]

Hello Experts,
I have HDMI display which has corrupted EDID checksum and its working with other ARM board with work around.
The same display I am using on Rpi3 & rpi zero boards and got the below output image.
https://drive.google.com/file/d/13h7srC ... HoO_9/view
Seems its using correct 1366x768 resolution but color is not correct, what could be the problem ?
And this is my config.txt file.
https://drive.google.com/file/d/1ydf13v ... rL1dq/view
Here is the link where I discussed the issue. BTW, this HDMI diplay works with Windows & Linux PC without any issues.
https://www.toradex.com/community/quest ... board.html

Patches:
https://share.toradex.com/lg644qhtqv1jnk9?direct
https://share.toradex.com/pyzdaan5ozk9v4k?direct

Can you please support me on this issue ?
How the EDID is handled in rpi hdmi driver if any corrupted or incorrect EDID data present ?
Thanks for the support.

[titusece]

Any help ?

[RaTTuS]

just force the resolution in config.txt

[titusece]

Hi,
Thanks for the input.

hdmi_group=2
hdmi_mode=81

I have tried to set the width & height manually, and got the attached output (Black image)

scv_15193196067411272355495.jpg (183.55 KiB) Viewed 3762 times

[HawaiianPi]

Try adding

Code: Select all

hdmi_ignore_edid=0xa5000080

to your config.txt. That tells Raspbian to completely ignore any EDID data in your monitor. You'll then have to provide the additional information in config.txt to get the correct resolution.

Try also adding:
hdmi_force_hotplug=1
hdmi_drive=1
hdmi_group=2
hdmi_mode=81

And if that doesn't work, try hdmi modes 86 or 39 instead.

And/or, you could try config_hdmi_boost= with a value of 6 to 11 (use the lowest value that helps).

[titusece]

Thank you very much.
It solved the issue, thanks again.

Code: Select all

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details
hdmi_edid_file=1
# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1366
#framebuffer_height=768

#Titus
hdmi_ignore_edid=0xa5000080
hdmi_force_hotplug=1
hdmi_drive=1

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1
# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=81

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
start_x=1
gpu_mem=128