Actions
Feature #950
closed
Update config.txt with HDMI configurations
Status:
Rejected
Priority:
Immediate
Assignee:
Category:
04 - Root File System
Target version:
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
Updated by
Actions