Public bug reported:
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: cryptsetup
Importance: Undecided
Status: New
** Affects: initramfs-tools
Importance: Undecided
Status: New
** Affects: linux-hwe-6.11 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: cryptsetup
Importance: Undecided
Status: New
** Also affects: initramfs-tools
Importance: Undecided
Status: New
** Description changed:
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
+ 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.
+ Power on the laptop and boot into Ubuntu 25.04.
- Wait for the LUKS password prompt to appear in verbose mode,
+ 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.
+ Wait for approximately 30 seconds without typing the password.
- Enter the password and press Enter.
+ 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 or un/re-plug
- cables from dock.
+ laptop screen. Only way to correct situation is to reboot and type LUKS
+ password faster or un/re-plug cables from dock.
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https://bugs.launchpad.net/bugs/2120448
Title:
External displays not detected after a ~30s delay entering LUKS
password on Dell Precision 5490 with SD25TB4 dock
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