Public bug reported:
After upgrading the Ubuntu 26.04 kernel from 7.0.0-27-generic to
7.0.0-28-generic, my Acer Nitro AN515-55 no longer restores the internal
display after suspend-to-RAM (S3/deep). The problem is also present in
7.0.0-29-generic.
The computer itself successfully resumes. I can connect to the machine
over SSH after the failed resume, networking works, and kernel logs
reach PM: suspend exit. The failure appears limited to restoration of
the internal Intel-driven eDP display/backlight.
Regression testing:
7.0.0-27-generic: WORKS
7.0.0-28-generic: FAILS
7.0.0-29-generic: FAILS
I tested 7.0.0-27 with the same NVIDIA 595.84 open driver currently used
on the newer kernels, and suspend/resume works normally.
Hardware:
Acer Nitro AN515-55
Intel CometLake-H GT2 UHD Graphics (i915)
NVIDIA GeForce RTX 3050 Mobile
Internal 1920x1080 eDP panel
BIOS V2.06
Failure behavior:
Boot 7.0.0-28 or 7.0.0-29.
Suspend using systemctl suspend or normal desktop suspend.
Wake the computer.
Computer resumes and remains accessible via SSH, but the internal laptop
display remains completely black.
During the failed state:
/sys/class/drm/card1-eDP-1/status reports connected.
i915_display_info reports Pipe A enabled and active and eDP-1 connected.
The framebuffer is reported visible.
/sys/class/backlight/intel_backlight/brightness accepts nonzero values.
/sys/class/backlight/intel_backlight/actual_brightness remains 0.
Writing brightness values manually does not restore the display.
Switching virtual terminals does not restore it.
Restarting GDM does not restore it.
Additional testing performed:
pm_test=devices: passes
pm_test=platform: passes
pm_test=core: passes
PRIME Intel-only mode: still fails on affected kernels
i915.enable_psr=0: no change
intel_iommu=off: no change
pcie_aspm=off: no fix
60 Hz instead of 144 Hz: no change
s2idle: does not behave correctly on this hardware
S3/deep is the normal sleep mode (s2idle [deep])
The regression therefore appears to have been introduced between Ubuntu
kernels 7.0.0-27 and 7.0.0-28, possibly affecting restoration of the
Intel i915/eDP panel or backlight following a real S3 transition.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: leo 3546 F.... wireplumber
/dev/snd/controlC1: leo 3546 F.... wireplumber
/dev/snd/seq: leo 3525 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 10 15:02:21 2026
InstallationDate: Installed on 2025-10-13 (301 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 1ea7:0064 SHARKOON Technologies GmbH 2.4GHz Wireless
rechargeable vertical mouse [More&Better]
Bus 001 Device 003: ID 04f2:b64f Chicony Electronics Co., Ltd HD User Facing
Bus 001 Device 004: ID 8087:0026 Intel Corp. AX201 Bluetooth
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: Acer Nitro AN515-55
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-7.0.0-29-generic
root=UUID=21d24b70-7c3c-4b62-8c0c-b0018d627618 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: 08/20/2021
dmi.bios.release: 2.6
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V2.06
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Stonic_CMS
dmi.board.vendor: CML
dmi.board.version: V2.06
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.06
dmi.ec.firmware.release: 2.5
dmi.modalias:
dmi:bvnInsydeCorp.:bvrV2.06:bd08/20/2021:br2.6:efr2.5:svnAcer:pnNitroAN515-55:pvrV2.06:rvnCML:rnStonic_CMS:rvrV2.06:cvnAcer:ct10:cvrV2.06:sku0000000000000000:pfaNitro5:
dmi.product.family: Nitro 5
dmi.product.name: Nitro AN515-55
dmi.product.sku: 0000000000000000
dmi.product.version: V2.06
dmi.sys.vendor: Acer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2163204
Title:
Regression: Acer Nitro AN515-55 internal eDP display/backlight fails
to resume from S3 since 7.0.0-28; 7.0.0-27 works
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