You have been subscribed to a public bug:
On a Dell Precision 5490 laptop connected to a Dell SD25TB4 dock,
external displays fail to be detected if there is a delay of
approximately 30 seconds or more before entering the LUKS disk
encryption password at boot. The issue does not occur if the password is
entered within ~10 seconds of the prompt appearing. This behavior is
observed on Ubuntu 25.04 in verbose boot mode.
Steps to Reproduce:
Connect the Dell Precision 5490 to a Dell SD25TB4 dock with external
monitors attached. External screens are sleeping.
Power on the laptop and boot into Ubuntu 25.04.
Wait for the LUKS password prompt to appear in verbose mode,
specifically the line: Begin: Mounting root file system ... Begin:
Running /scripts/local-top ... Please unlock disk crypt_dev_nuvme0n1p3:
Wait for approximately 30 seconds without typing the password.
Enter the password and press Enter.
Expected Result:
The system should boot successfully and automatically wakeup and detect
the external displays, regardless of the time taken to enter the LUKS
password.
Actual Result:
After the 30-second delay, the system boots, but the external displays
are not wakenup, not detected or configured and boot continue with only
laptop screen. Only way to correct situation is to reboot and type LUKS
password faster or un/re-plug cables from dock.
** Affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
** Affects: cryptsetup (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
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External displays not detected after a ~30s delay entering LUKS password on
Dell Precision 5490 with SD25TB4 dock
https://bugs.launchpad.net/bugs/2120448
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seeded packages, which is subscribed to initramfs-tools in Ubuntu.
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