[Bug 1944397] Re: HDMI does not display anything with Impish RPi desktop image

[satmandu]

@waveform The issue might be with the bcm2711-rpi-4-b.dtb...

sudo dpkg -i linux-firmware-raspi2_5-0ubuntu0~21.04~ppa1_arm64.deb ;
sudo flash-kernel --force 5.11.22-9021-raspi ; sudo reboot

Result: no video.

sudo dpkg -i linux-firmware-raspi2_5-0ubuntu1~ppa1_arm64.deb ; sudo
flash-kernel --force 5.11.22-9021-raspi ; sudo reboot

Result: no video.

cd /boot ; sudo cp dtb-5.11.22-9021-raspi
/boot/firmware/bcm2711-rpi-4-b.dtb ; sudo reboot

Result: Video!

sudo flash-kernel ; cd /boot ; sudo cp dtb-5.11.22-9021-raspi
/boot/firmware/bcm2711-rpi-4-b.dtb ; sudo reboot

Result: Video!

So maybe there's an issue with the bcm2711-rpi-4-b.dtb which the newer
firmwares are installing causing issues with the newer kernels?

Working firmware versions I am seeing that work with the older 5.11
bcm2711-rpi-4-b.dtb:

sudo vcgencmd version
Aug 31 2021 14:52:47
Copyright (c) 2012 Broadcom
version 67615e950e1e28b92dfae6303cf7a8b879a8908f (clean) (release) (start)

sudo vcgencmd version
Sep 30 2021 19:21:03
Copyright (c) 2012 Broadcom
version 51215b4f6e3966401ecd99652a35cf1c25069113 (clean) (release) (start)



** Attachment added: "debug info from working boot with 5.11 bcm2711-rpi-4-b.dtb"
   https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1944397/+attachment/5530890/+files/impish-10_05_2021_2152EDT.txt

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https://bugs.launchpad.net/bugs/1944397

Title:
  HDMI does not display anything with Impish RPi desktop image

Status in linux-firmware-raspi2 package in Ubuntu:
  Confirmed
Status in linux-raspi package in Ubuntu:
  Fix Committed
Status in linux-raspi source package in Hirsute:
  Confirmed
Status in linux-firmware-raspi2 source package in Impish:
  Confirmed
Status in linux-raspi source package in Impish:
  Fix Committed

Bug description:
  [ Impact ]

  The desktop does not come up and the screen stays blank when using
  'dtoverlay=vc4-kms-v3d' on a Pi 4 (as is the case in raspi desktop
  images). If the desktop does come up, playing video freezes the
  desktop and/or the system. The kernel log shows loads of WARNINGs and
  potentially firmware errors.

  [ Test Case ]

  Use a raspi desktop image, play video (youtube or VLC), move windows
  around, switch to and from fullscreen video playback.

  [ Where problems could occur ]

  The fixes are all local to the VC4 driver so (new) issues should only
  show up when that driver is in use. Potential problems are UI freezes,
  kernel stalls and crashes.

  [ Original Description ]

  Workaround
  ----------
  With media which you will boot off of change the line dtoverlay=vc4-kms-v3d to dtoverlay=vc4-fkms-v3d in /system-boot/config.txt

  Original Description
  --------------------
  Have a HDMI display w/o audio hooked up to this RPI4B.

  With the latest kernel update the screen does not turn on due to this.

  ProblemType: BugDistroRelease: Ubuntu 21.10
  Package: linux-image-5.13.0-1007-raspi 5.13.0-1007.8
  ProcVersionSignature: Ubuntu 5.13.0-1007.8-raspi 5.13.13
  Uname: Linux 5.13.0-1007-raspi aarch64
  ApportVersion: 2.20.11-0ubuntu69
  Architecture: arm64
  CasperMD5CheckResult: unknown
  Date: Mon Sep 20 20:56:14 2021
  ImageMediaBuild: 20210421
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   TERM=vt100
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, user)SourcePackage: linux-raspi
  UpgradeStatus: Upgraded to impish on 2021-08-17 (34 days ago)

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