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Feature #810

closed

Need updated config.txt options if 7" touchscreen is found

Added by Hammel over 1 year ago. Updated over 1 year ago.

Status:
Closed
Priority:
Immediate
Assignee:
Category:
02 - GPU Firmware
Target version:
Start date:
15 Feb 2021
Due date:
% Done:

100%

Estimated time:
Severity:
03 - Medium

Description

The RPi3 connected to an official 7" HDMI display plays videos with lots of jitter. This is not a GPU/CPU problem nor is it a network transfer problem. It's likely a display configuration problem. I found a fix by modifying the config.txt.

I can check the name of the monitor in firstboot with this:

  1. /opt/vc/bin/tvservice -n
    device_name=Ras-LCD Panel

I need to update config.txt with the following options if the display is found to be the 7" touchscreen. Some of this is already done in firstboot.

diff firmware/config.txt updated/config.txt
36a37,38
> hdmi_ignore_edid=0xa5000080
>
58c60
< #config_hdmi_boost=4
---
> config_hdmi_boost=7
91c93
< # gpu_mem=128
---
> gpu_mem=320
101a104,122
> initramfs initramfs.gz followkernel
>
> # Raspberry Pi Touchscreen setup
> dtoverlay=rpi-ft5406-overlay
> lcd_rotate=2
> framebuffer_width=800
> framebuffer_height=480
> fbwidth=800
> fbheight=480
> dtoverlay=pi3-disable-wifi
> hdmi_group=2
> hdmi_mode=87
> hdmi_cvt=800 480 60 6 0 0 0
> hdmi_drive=1
>
> force_turbo=1
> arm_freq=1400
> core_freq=500
> over_voltage=4
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