Raspberry Pi 4 no HDMI output after plymouth boot screen

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#1,232 5 comments 2 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
linux, raspberry-pi
Domain
embedded-iot, operating-systems

Research direction

Start with the reproduction steps using config.txt and the listed Raspberry Pi OS, firmware, and kernel versions. Compare HDMI output before and after the Plymouth boot screen, then check whether tvservice -e "DMT 27 HDMI" restores it. Done means the configured hdmi_group=2 and hdmi_mode=27 settings keep producing a signal after Plymouth without the manual tvservice command.

Written by the indexing model from the issue text.

Description

Describe the bug
When specifying hdmi_group=2 and hdmi_mode=27 the raspberry pi outputs a signal of the correct resolution during boot but stops to do so after showing the plymouth boot screen. Forcing an output using tvservice -e "DMT 27 HDMI" however fixes this.

To reproduce

  1. Burn a fresh image to an sd card
  2. Add the following to config.txt 
    hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=27
hdmi_drive=2
  3. Boot the raspberry pi
  4. (Optionally update and retry)
  5. Login via ssh and execute tvservice -e "DMT 27 HDMI"

Expected behaviour
Raspberry Pi boots and outputs a signal.

Actual behaviour
Raspberry Pi boots, outputs a signal (of the correct resolution and refresh rate) until it shows the plymouth boot screen. After that no signal is output.

System

  • Raspberry Pi Model: RPi4B
  • Display: Beetronics 7TS4
  • Which OS and version (cat /etc/rpi-issue)? 
    Raspberry Pi reference 2019-07-10
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 175dfb027ffabd4b8d5080097af0e51ed9a4a56c, stage4
  • Which firmware version (vcgencmd version)? 
    Aug 15 2019 12:03:51 
Copyright (c) 2012 Broadcom
version 9f8431fb7839c7f00f52b81f5822ddab2b31d0db (clean) (release) (start)
  • Which kernel version (uname -a)? 
    Linux raspberrypi 4.19.66-v7l+ #1253 SMP Thu Aug 15 12:02:08 BST 2019 armv7l GNU/Linux

Additional context
EDID data from the display:
edid.zip

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