Public bug reported:
The internal display remains dark after resuming from suspend on a
Lenovo ThinkPad T470s with linux-image-7.0.0-28-generic.
The system itself resumes successfully. It remains reachable and the
journal records a successful ACPI S3/deep suspend and resume, including:
PM: suspend entry (deep)
ACPI: PM: Low-level resume complete
ACPI: PM: Waking up from system sleep state S3
PM: suspend exit
Regression test:
- linux-image-7.0.0-27-generic: resumes correctly
- linux-image-7.0.0-28-generic: internal display remains dark
The same installation, firmware, hardware and userspace are used in
both tests.
The following workarounds did not resolve the problem:
- i915.enable_psr=0
- i915.enable_dc=0
- acpi_backlight=native
GPU:
Intel Skylake-U GT2 integrated graphics, PCI device 8086:1916
Suspend mode:
ACPI S3 / deep
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28
ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6
Uname: Linux 7.0.0-27-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: o 3605 F.... wireplumber
/dev/snd/seq: o 3599 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Fri Jul 31 19:21:40 2026
InstallationDate: Installed on 2026-06-28 (33 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 20JTS35000
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-27-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash i915.enable_psr=0
i915.enable_dc=0 acpi_backlight=native
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/05/2024
dmi.bios.release: 1.55
dmi.bios.vendor: LENOVO
dmi.bios.version: N1WET76W (1.55 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20JTS35000
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.22
dmi.modalias:
dmi:bvnLENOVO:bvrN1WET76W(1.55):bd11/05/2024:br1.55:efr1.22:svnLENOVO:pn20JTS35000:pvrThinkPadT470sW10DG:rvnLENOVO:rn20JTS35000:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20JT_BU_Think_FM_ThinkPadT470sW10DG:pfaThinkPadT470sW10DG:
dmi.product.family: ThinkPad T470s W10DG
dmi.product.name: 20JTS35000
dmi.product.sku: LENOVO_MT_20JT_BU_Think_FM_ThinkPad T470s W10DG
dmi.product.version: ThinkPad T470s W10DG
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2162602
Title:
ThinkPad T470s internal display remains dark after resume with linux
7.0.0-28
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