Public bug reported:
Summary
Suspend/resume consistently fails to restore the display on a Lenovo
ThinkPad P1 Gen 7 with Intel 135H CPU (no dedicated GPU).
The system appears to resume successfully (keyboard remains responsive,
Caps Lock light toggles), but the internal display remains black.
Sometimes connecting an external monitor immediately restores both displays
(laptop screen and external monitor). Other times neither the internal nor
external display comes back and a hard reboot is required.
Hardware
Lenovo ThinkPad P1 Gen 7
Intel Core Ultra 5 135H
Intel Arc integrated graphics only (no NVIDIA GPU)
BIOS N48ET34W (1.21)
Software
Ubuntu 26.04, installed from official Ubuntu ISO on July 25th 2026.
Kernel 7.0.0-28-generic
GNOME on Wayland
Suspend mode: s2idle
Graphics driver: i915 (xe driver available, but i915 seems to be the
default)
Steps to reproduce
Boot normally.
Suspend the system.
Resume the system.
Note, does NOT occur on every suspend/resume cycle, only sometimes.
It seems to happen more consistently when the computer has been
suspended for a long time. Quick suspend/resume cycles in rapid
succession are usually successful (but not always).
Expected result
The display should restore normally.
Actual result
The system resumes but the display remains black.
Caps Lock continues to function, and well as other keyboard lights,
indicating the system is still running.
Sometimes attaching an external monitor restores the display. Other
times it does not.
One time it brought itself back on after a few minutes, but I have not
been able to reproduce that in a while.
Relevant kernel messages
After resume the kernel reports Intel i915 display failures including:
Failed to bring PHY A to idle
Timeout waiting for DDI BUF A
flip_done timed out
DPLL hardware state mismatch
These occur immediately after resume.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jeff 4502 F.... pipewire
jeff 4522 F.... wireplumber
/dev/snd/seq: jeff 4502 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 27 21:21:31 2026
InstallationDate: Installed on 2026-07-23 (4 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 21KVCTO1WW
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=/boot/vmlinuz-7.0.0-28-generic
root=UUID=c5c9f1a7-f9a8-4681-8d58-4dbe3736da6e ro quiet splash
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: 05/11/2026
dmi.bios.release: 1.21
dmi.bios.vendor: LENOVO
dmi.bios.version: N48ET34W (1.21 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21KVCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.15
dmi.modalias:
dmi:bvnLENOVO:bvrN48ET34W(1.21):bd05/11/2026:br1.21:efr1.15:svnLENOVO:pn21KVCTO1WW:pvrThinkPadP1Gen7:rvnLENOVO:rn21KVCTO1WW:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21KV_BU_Think_FM_ThinkPadP1Gen7:pfaThinkPadP1Gen7:
dmi.product.family: ThinkPad P1 Gen 7
dmi.product.name: 21KVCTO1WW
dmi.product.sku: LENOVO_MT_21KV_BU_Think_FM_ThinkPad P1 Gen 7
dmi.product.version: ThinkPad P1 Gen 7
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "journalctl -b -1 > previous-boot.log"
https://bugs.launchpad.net/bugs/2161937/+attachment/5987198/+files/previous-boot.log
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https://bugs.launchpad.net/bugs/2161937
Title:
ThinkPad P1 Gen 7 (Intel Meteor Lake) black screen after suspend
(s2idle) on Ubuntu 26.04
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