Pi 4 Rev 1.5 Display Issues

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Benjamineparnell
 
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Pi 4 Rev 1.5 Display Issues

Post by Benjamineparnell »

Hello,

I have the Raspberry Pi 4 Model B Rev 1.5 2GB
I connect my HDMI0 only displays 480x640. That is the only option in the screen resolution menu.
My HDMI1 only goes up to 1368x768
I believe both ports are suppose to output 4k. I have tried so many different command line fixes that I cannot remember.
I also tried a monitor and tv, both 4k compatible.
Is this a common problem? Do you have a solution?
It seems to me that it is a hardware issue.

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adafruit_support_mike
 
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Re: Pi 4 Rev 1.5 Display Issues

Post by adafruit_support_mike »

From the Raspberry Pi documentation:
The Raspberry Pi 4 can drive up to two displays, with a resolution up to 1080p at a 60Hz refresh rate. At 4K resolution, if you connect two displays then you are limited to a 30Hz refresh rate. You can also drive a single display at 4K with a 60Hz refresh rate: this requires that the display is attached to the HDMI port adjacent to the USB-C power input (labelled HDMI0). You must also enable 4Kp60 output by setting the hdmi_enable_4kp60=1 flag in config.txt. This flag can also be set using the 'Raspberry Pi Configuration' tool within the desktop environment.
https://www.raspberrypi.com/documentati ... figuration

What output do you get from the command:

Code: Select all

    xrandr --verbose | edid-decode

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Benjamineparnell
 
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Re: Pi 4 Rev 1.5 Display Issues

Post by Benjamineparnell »

EDID length 2117 is not a multiple of 128.

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Benjamineparnell
 
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Re: Pi 4 Rev 1.5 Display Issues

Post by Benjamineparnell »

The problem I mentioned is with only 1 display connected. I am not trying 2 displays at this time and I still only get 480x640 on HDMI0

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adafruit_support_mike
 
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Re: Pi 4 Rev 1.5 Display Issues

Post by adafruit_support_mike »

It sounds like the RasPi can't get a valid list of supported resolutions from the display, so you'll need to set the resolution in your /boot/config.txt file.

This section from the RasPi documentation lists the options you'll need:

https://www.raspberrypi.com/documentati ... eo-options

You'll want

Code: Select all

hdmi_ignore_edid to 0xa5000080
and a pair of group/mode values that have the right resolution and timing for your display.

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Benjamineparnell
 
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Re: Pi 4 Rev 1.5 Display Issues

Post by Benjamineparnell »

adafruit_support_mike wrote: Fri Jan 06, 2023 12:29 am It sounds like the RasPi can't get a valid list of supported resolutions from the display, so you'll need to set the resolution in your /boot/config.txt file.

This section from the RasPi documentation lists the options you'll need:

https://www.raspberrypi.com/documentati ... eo-options

You'll want

Code: Select all

hdmi_ignore_edid to 0xa5000080
and a pair of group/mode values that have the right resolution and timing for your display.

Mike,

Another person pointed out that it might be my adapter cable. I ordered a new cable and if that does not fix it I will follow up with this post. Thank you for the help so far.

Ben

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