[i915] ‘no signal’ after monitor sleep or monitor turned off
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Expired
|
Undecided
|
Unassigned | ||
mutter (Ubuntu) |
Expired
|
Undecided
|
Unassigned |
Bug Description
The problem and a workaround is well described here: https:/
My laptop is connected to an external monitor (Dell) via HDMI. When the laptop is left idle for some time, the screen goes black and the monitor reports "no signal". When I press a keyboard button or move the mouse, the laptop screen comes on...but the monitor still receives no signal.
Workaround 1 is to unplug and replug the HDMI cable.
Workaround 2 is to press ctrl-alt-F3 to get into a text-based console, and then ctrl-alt-F1 or F2 to get back to graphical mode
My laptop has Intel GPU, not Nvidia, so this seems to be a problem with Ubuntu.
I'm currently running Ubuntu 24.04 LTS
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSign
Uname: Linux 6.8.0-31-generic x86_64
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckR
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat May 25 12:23:02 2024
DistUpgraded: Fresh install
DistroCodename: noble
DistroVariant: ubuntu
ExtraDebuggingI
GraphicsCard:
Intel Corporation Meteor Lake-P [Intel Graphics] [8086:7d45] (rev 08) (prog-if 00 [VGA controller])
Subsystem: Lenovo Meteor Lake-P [Intel Graphics] [17aa:231e]
InstallationDate: Installed on 2024-04-30 (25 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
MachineType: LENOVO 21KCCTO1WW
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-
XDG_RUNTIME_
ProcKernelCmdLine: BOOT_IMAGE=
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/02/2024
dmi.bios.release: 1.27
dmi.bios.vendor: LENOVO
dmi.bios.version: N3YET62W (1.27 )
dmi.board.
dmi.board.name: 21KCCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76461 WIN
dmi.chassis.
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.
dmi.ec.
dmi.modalias: dmi:bvnLENOVO:
dmi.product.family: ThinkPad X1 Carbon Gen 12
dmi.product.name: 21KCCTO1WW
dmi.product.sku: LENOVO_
dmi.product.
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.120-2build1
version.
version.
version.
version.
version.
version.
version.
Changed in linux (Ubuntu): | |
status: | New → Incomplete |
Changed in mutter (Ubuntu): | |
status: | New → Incomplete |
I have the same problem: whenever my laptop sleeps two external monitors flicker/blink for a while and then show "no signal" message. Only one solution that sometimes helps is to open laptop lid or disconnect/connect monitors.