[Bug 1888781] Re: failed to boot with 1.20200601+arm64-0ubuntu2~20.04.1

[Roland Kaiser]

Ran into this issue today as well. My hardware is a Pi 3B with the boot
disk attached to a USB port.

I can still connect to the Pi via SSH, so it appears to be merely a
problem with the video output.

Current focal "daily-preinstalled" server images seem to be broken from
the get go. So for new installs I now use 20.04.2 images, which still
work, then immediately downgrade and pin flash-kernel and linux-
firmware-raspi2 packages:


sudo apt install -y flash-kernel=3.98ubuntu12 linux-firmware-raspi2=1.20200212-0ubuntu1

cat <<EOF | sudo tee /etc/apt/preferences.d/raspi-hdmi-workaround
Package: flash-kernel
Pin: 3.98ubuntu12
Pin-Priority: 999

Package: linux-firmware-raspi2
Pin: 1.20200212-0ubuntu1
Pin-Priority: 999
EOF


The root cause may actually lie with the flash-kernel package. I'm not sure how these two interact.

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https://bugs.launchpad.net/bugs/1888781

Title:
  failed to boot with 1.20200601+arm64-0ubuntu2~20.04.1

Status in linux-firmware-raspi2 package in Ubuntu:
  Confirmed

Bug description:
  I have a raspberry pi 3b with ubuntu 20.04 armhf. It failed to boot
  after upgrading linux-firmware-raspi2 from 1.20200212-0ubuntu1 to
  1.20200601+arm64-0ubuntu2~20.04.1.

  The HDMI monitor can't get any signal. The ACT led turned on for about
  0.5 second then turned off.

  I restored start.elf and fixup.dat from 1.20200212-0ubuntu1, and it
  works again.

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