Public bug reported:
The internal eDP panel goes permanently black after 2-3 hours of normal
uptime. The external monitor (on the NVIDIA dGPU) continues working.
Hardware: Lenovo ThinkPad P1 Gen 8 (21Q8CTO1WW), Intel Arrow Lake-H.
i915 reports: "Found meteorlake (device ID 7d51) integrated display
version 14.00 stepping D0". Panel: AUO 0x2ea5, 3840x2400. BIOS 1.09
(N4EET23W), latest available.
First fault in dmesg, with nothing preceding it:
i915 0000:00:02.0: [drm] *ERROR* Timed out waiting for DP idle patterns
i915 0000:00:02.0: [drm] *ERROR* CPU pipe A FIFO underrun
At this point the kernel still reports eDP-1 as connected and enabled,
the backlight is on (intel_backlight 245/800, bl_power 0), and mutter
still lists the output as an active logical monitor. The panel simply
scans out black.
Steps to reproduce: boot, use the machine normally with an external
DisplayPort monitor attached via a Thunderbolt dock. Occurs after
roughly 2-3 hours. Observed on 3 of 3 days of use.
NOT suspend/resume related: one occurrence had no "PM: suspend entry"
anywhere in the boot's dmesg.
NOT PSR: reproduces with PSR disabled via
/sys/kernel/debug/dri/1/i915_edp_psr_debug.
Escalation: any subsequent modeset while in this state triggers
intel_dp_retrain_link -> intel_ddi_post_disable -> WARN at
intel_display.c:363 in intel_disable_transcoder ("pipe_off wait timed
out"), followed by endless "[CRTC:150:pipe A] flip_done timed out" at
~10s per atomic commit. gnome-shell then blocks uninterruptibly in
drm_mode_atomic_ioctl and cannot be killed even with SIGKILL,
requiring a hard power-off.
Kernels affected: 7.0.0-28-generic and 7.0.0-1009-oem (both 7.0 base).
6.17.0-35-generic not yet tested.
Possibly related: ACPI method \_SB.PC00.LPCB.EC.BRNS aborts with
AE_AML_PACKAGE_LIMIT (zero-length package), taking _Q26/_Q27 with it,
consistently within ~1 second of the display fault. Present in latest
firmware.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-1009-oem 7.0.0-1009.9
ProcVersionSignature: Ubuntu 7.0.0-1009.9-oem 7.0.12
Uname: Linux 7.0.0-1009-oem x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Jul 30 15:22:29 2026
InstallationDate: Installed on 2025-11-17 (255 days ago)
InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/zsh
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: linux-signed-oem-7.0
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-oem-7.0 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2162145
Title:
i915: eDP-1 goes black after 2-3h uptime on ThinkPad P1 Gen 8 (Arrow
Lake-H, MTL display 14.00) - Timed out waiting for DP idle patterns
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