Public bug reported:
Laptop: ThinkPad 13 gen 2
OS: Ubuntu 24.04.2 LTS (Noble Numbat) with FDE/TPM
I think I had an update of my laptop running noble of the kernel snap
that made most of the interfaces unavailable. Also, I had to enter my
FDE recovery key at some point during reboot process before noticing the
issue.
In order to fix this, I wanted to fallback to previous kernel through
GRUB entry (how I used to do it). BUT there was only some Ubuntu core
entries. Since I am using FDE backed by a TPM, I think my kernel is then
managed by a snap package.
Even if most interfaces (wifi, ethernet, trackpad...) were not working I
managed to login into the desktop (same for X and Wayland) and had a
terminal and the laptop keyboard working. (even though the laptop
specific Thinkpad features were not functioning: no mute LED, no mic cut
LED...).
Once logged in, I checked kernel version and I was running kernel
6.8.0-56.
I saw I had two available version of the kernel for pc-kernel snap: pc-
kernel 6.8.0-54.56 rev 2247 and pc-kernel 6.8.0-56.58+1 rev 2352.
I suspect pc-kernel 6.8.0-56.58+1 rev 2352 to be problematic.
In order to fallback to the previous kernel, I reverted the current
snap:
```
sudo snap revert pc-kernel
```
After a reboot: I have all my interfaces back with 6.8.0-54-generic and
the problematic version disabled.
```
user@ThinkPad13gen2:~$ snap list pc-kernel --all
Name Version Rev Tracking Publisher Notes
pc-kernel 6.8.0-54.56 2247 24/stable canonical✓ kernel
pc-kernel 6.8.0-56.58+1 2352 24/stable canonical✓ kernel,disabled
```
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: kernel-bug
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https://bugs.launchpad.net/bugs/2104933
Title:
Multiple interfaces unavailable after kernel update
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