Bug#1137142: linux-image-amd64: Screen goes black dozen of seconds after resume from suspend state on ThinkPad T16 2023

Package: linux-image-amd64
Version: 6.12.88-1
Severity: important
Tags: upstream
X-Debbugs-Cc: [email protected], [email protected]
User: [email protected]
Usertags: amd64

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?

     After upgrading from linux-image-6.12.85+deb13-amd64 to
     linux-image-6.12.85+deb13-amd64 for fix of CVE-2026-31431, and
     to linux-image-6.12.88+deb13-amd64 for fix of later CVE(s), my
     ThinkPad T16 AMD 2023 frequently goes black after resuming from
     suspend state. The problem can be reproduced when I was running
     linux-image-6.12.85+deb13-amd64 or linux-image-6.12.88+deb13-amd64.

     Call Trace from journalctl --dmesg that keep appearing during the
     problematic period:

     <TASK>
     __schedule+0x505/0xc00
     schedule+0x27/0xf0
     schedule_timeout+0x12f/0x160
     wait_for_completion+0x8a/0x160
     __flush_work+0x269/0x350
     ? __pfx_wq_barrier_func+0x10/0x10
     __lru_add_drain_all+0x143/0x1e0
     khugepaged+0x65/0x940
     ? __pfx_autoremove_wake_function+0x10/0x10
     ? __pfx_khugepaged+0x10/0x10
     kthread+0xcf/0x100
     ? __pfx_kthread+0x10/0x10
     ret_from_fork+0x31/0x50
     ? __pfx_kthread+0x10/0x10
     ret_from_fork_asm+0x1a/0x30
     </TASK>

     I can provide more kernel log if requested. I assume this is an
     upstream issue, but up until current latest stable Debian kernel
     as of 2026-05-20 the problem persist. Can't reproduce the issue
     on 6.12.74+deb13.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

     Suspend and then resume my laptop.

   * What was the outcome of this action?

     When the screen goes black, I can not use my laptop locally as
     there is no feedback. Closing the laptop lid and opening it again
     makes the screen go back to normal for a dozen of seconds and it
     would went black again.

   * What outcome did you expect instead?

     Suspend and resuming would work normally.
     To prevent affecting my daily usage, I have to reboot back into
     linux-image-6.12.74+deb13+1-amd64 and keep using workarounds of
     recent LPE CVEs.

-- System Information:
Debian Release: 13.5
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.74+deb13+1-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=zh_CN.UTF-8, LC_CTYPE=zh_CN.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-amd64 depends on:
ii  linux-image-6.12.88+deb13-amd64  6.12.88-1

linux-image-amd64 recommends no packages.

linux-image-amd64 suggests no packages.

-- no debconf information