** Also affects: plymouth (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2097229
Title:
Issues with Thunderbolt in initrd: Devices recognized but not working
Status in cryptsetup package in Ubuntu:
New
Status in initrd-tools package in Ubuntu:
New
Status in plymouth package in Ubuntu:
New
Status in thunderbolt-tools package in Ubuntu:
New
Bug description:
I'm facing an issue with Thunderbolt in initrd on a Lenovo Yoga X1
Gen8 in conjunction with the Lenovo Thunderbolt 3 Dock (40AN, Gen 2)
when using Ubuntu 24 with Kernel 6.8 and 6.11.
Cross-checking the same dock and the same SSD within another Laptop
(older HP ProBook 450 G6 with only USB 3.2 support, no Thunderbolt)
proofs my suspicion that the hardware works fine but it is some
software related issue.
Step to Step:
When starting the Laptop USB generic drivers are loaded and the Dock is
recognized.
The dock works flawlessly in pre-boot environments such as UEFI and GRUB with
the loaded USB generic driver.
As soon as GRUB is attempting to start the selected system and initrd is
loaded to prompt the LUKS passphrase, I recognize the USB generic drivers are
dropped and the Thunderbolt module is loaded due to onscreen prompts:
thunderbolt 1-0:1.1: new retimer found, vendor ...
thunderbolt 1-1: new device found, vendor ...
thunderbolt 1-1: Lenovo ThinkPad Thunderbolt 3 Dock
As soon as the Thunderbolt module is loaded the devices connected to
the dock shut off: Monitors turn blank, Keyboard backlights and Mouse
status indicator LEDs turn off. I assume the power supply to the
laptop does still work, but do not know for sure.
This causes that only Monitors or Keyboards connected to the Laptop
directly via USB or HDMI will work for entering the passphrase, as
well as the internal Monitor and Keyboard (-> which are connected via
USB generic and not Thunderbolt).
Deactivating Thunderbolt in the UEFI of the Lenovo machine proofs my
assumption again: The dock works flawlessly in UEFI, GRUB as well as
the plymouth/LUKS environment as it is now acting as USB3.2 device.
I suspect a faulty implementation of the Thunderbolt Module or Security
Policies prohibiting its use:
As soon as the LUKS passphrase is entered correct and the system loads,
Thunderbolt modules are loaded fresh again and from that moment on work
properly.
That is why I was hoping for the best case of security policies blocking
Thunderbolt inputs in the initrd/LUKS passphrase/plymouth stage, but I found no
documentation if there is such and how to change that policy.
I also did not find any workaround to drop Thunderbolt for initrd and
set USB generic drivers only.
Here is some similar report that the issue exists since Kernel 5.4, but they
did not have the same conclusion/mentioning of USB-generic drivers vs.
Thunderbolt drivers:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901215
Thanks for your help
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