Debian-raspberrypi buster does not boot up properly without a monitor connected

To: debian-user@lists.debian.org
Subject: Debian-raspberrypi buster does not boot up properly without a monitor connected
From: Johannes Pieper <johpie@gmx.de>
Date: Fri, 7 Jan 2022 11:03:23 +0100
Message-id: <[🔎] 1659291F-DF52-4E7B-B726-3EB99A915AB3@gmx.de>

Good morning everyone!

I installed the latest 24.11.21 tested bullseye image on ssd disk connected via USB adapter to  a raspberry pi  4.

As long as a Monitor is connected via HDMI adaptor to the pi  everything works fine. I can log in directly on the machine or via ssh remotely.
In case no monitor is connected and the pi is powered up it is not even possible to ping the device. It seems the boot /startup process hangs somewhere. Can someone point me to what to check for?   

Thanks in advance and Best regards
Johannes Pieper

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