Bug#1104788: linux-image-6.1.0-34-amd64: ThinkPad T14 Gen2 fails to bring up displays, Thunderbolt 4 Dock, i915 Kernel messages

[Salvatore Bonaccorso <carnil@debian.org>]

Control: tags -1 + moreinfo

Hi,

On Tue, May 06, 2025 at 01:31:20PM +0000, sebastianst@gmx.net wrote:
> Package: src:linux
> Version: 6.1.135-1
> Severity: normal
> 
> Dear Maintainer,
> 
> Lenovo ThinkPad T14 Gen 2 fails to bring up external displays connected to the Lenovo Thunderbolt 4 Dock 40B0, when the laptop is connected to the docking station and powered on using the power button of the docking station. 
> Instead of a normal boot, several Kernel messages related to i915 are shown.
> 
> The problem occurs with ThinkPad T14 Gen 2.
> 
> The process works fine with the same docking station connected to a ThinkPad T14 Gen 3. So we can rule out a defect of the docking station which is brand new.

Thanks for your report. We had a discussion about your but in todays
meeting, and we are missing context before the warnings and suspect
that they are not the real underlying cause directly. So could you
please provide a full kernel log up to those warnings and attach it to
this bugreport?

Regards,
Salvatore