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Bug#1131158: Debian Bug #1131158

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I would like to mention that I think this is the same bug I have hit.

I am using Debian Stable but BACKPORTS kernels on a new-ish (Dec 2025) :

Thinkpad P14s Gen6 AMD

I pass the kernel boot parameter :

amdgpu.dcdebugmask=0x10

to fix some X/screen issues (slow redraw, lock-ups).

Suspend works when I close the laptop lid.

However, updating to the last backport kernel "6.18.15+deb13" caused 
suspend to break. The laptop seems to suspend on lid close (red lid 
light starts flashing normally) but in the morning the laptop is warm 
and the battery has drained.

To summarise :

6.18.12+deb13-amd64 -- ok

6.18.15+deb13-amd64 -- BAD suspend

I installed the latest "testing" kernel "6.19.6+deb14+1" and suspend 
works OK again.

6.19.6+deb14+1-amd64 - ok

In case it is useful, I attach the output of lspci.


Cheers,


-- 
Alastair Sherringham
blog : https://www.sherringham.net/blog
art: https://art.sherringham.net

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Bug#1131158: linux: regression on ThinkPad T14s Gen 4 AMD: 6.18.15 backports fails to reach S0i3 on s2idle, 6.12.74 works Andrea V <andreakarimodm@gmail.com> - 2026-03-18 12:10 +0100
  Bug#1131158: linux: regression on ThinkPad T14s Gen 4 AMD: 6.18.15 backports fails to reach S0i3 on s2idle, 6.12.74 works Salvatore Bonaccorso <carnil@debian.org> - 2026-03-18 13:50 +0100
  Processed: Re: Bug#1131158: linux: regression on ThinkPad T14s  Gen 4 AMD: 6.18.15 backports fails to reach S0i3 on s2idle, 6.12.74 works "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-18 13:50 +0100
  Bug#1131158: Debian Bug #1131158 Alastair Sherringham <alastair@sherringham.net> - 2026-03-19 18:00 +0100

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