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Feature #950

closed

Update config.txt with HDMI configurations

Added by Hammel almost 2 years ago. Updated over 1 year ago.

Status:
Rejected
Priority:
Immediate
Assignee:
Hammel
Category:
04 - Root File System
Target version:
3.0 - Corrino
Start date:
26 Mar 2023
Due date:
% Done:

100%

Estimated time:
Severity:
01 - Critical

Description

The config.txt supports include statements.

Firstboot can identify the HDMI device name from it's EDID with

$ /opt/vc/bin/tvservice -n
device_name=MPI-MPITEST

This can allow selection of a display-specific config.txt to include into config.txt. For example, the Elecrow 5in Touchscreen requires the following config.txt settings.
# elecrow 5" HDMI touchscreen
hdmi_force_hotplug=1
max_usb_current=1
hdmi_drive=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0
dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900 display_rotate=0

Firstboot identifies the device as the MPI-MPITEST and copies MPI-MPITEST-config.txt to hdmiconfig.txt, which is included at the end of config.txt. This makes it easy to add new display configurations, by just getting their EDID device ID and creating a config.txt specific to them.

The display specific configs will need to be stored in the dev platform under /etc/displays/.

Related issues

Precedes PiBox - Feature #948: Support elecrow 5" hdmi touchscreen displayClosedHammel27 Mar 202327 Mar 2023

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 #1

Updated by Hammel almost 2 years ago

  • Precedes Feature #948: Support elecrow 5" hdmi touchscreen display added
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 #2

Updated by Hammel almost 2 years ago

S15Config will handle updating the config.txt. Here is the pseudo code for that.

  1. Get the device id: /opt/vc/bin/tvservice -n
    1. This sets device_name=<edid device name>
  2. Append this to /etc/pibox-config
  3. Search for matching config in /etc/displays.
    1. If found, copy to /media/mmcblk0p1/hdmi-config.txt
    2. If not found, zero out /media/mmcblk0p1/hdmi-config.txt

This implies the addition of the following line to the default config.txt in the dev platform.

include hdmi-config.txt

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 #3

Updated by Hammel almost 2 years ago

  • Target version changed from 2.0 - Harkonnen to 3.0 - Corrino
  • Severity changed from 01 - Critical to 02 - High

Moving to 3.0 since the Pi Zero support is not going to make it for PiBox 2.0.

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 #4

Updated by Hammel almost 2 years ago

  • Priority changed from Immediate to Urgent
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 #5

Updated by Hammel over 1 year ago

  • Priority changed from Urgent to Immediate
  • Severity changed from 02 - High to 04 - Low
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 #6

Updated by Hammel over 1 year ago

In the following case: 

# /opt/vc/bin/tvservice -n
[E] No device present

There is nothing to do since there is no attached HDMI monitor.

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 #7

Updated by Hammel over 1 year ago

  • Severity changed from 04 - Low to 01 - Critical
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 #8

Updated by Hammel over 1 year ago

  • Status changed from New to Rejected
  • % Done changed from 0 to 100

This is effectively a duplicate of RM #948. The solution to the problem can be found in that issue.

Rejecting this issue.

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