*** This bug is a duplicate of bug 2084046 ***
https://bugs.launchpad.net/bugs/2084046
** This bug has been marked a duplicate of bug 2084046
[i915] Phantom "Unknown" display detected on Intel Meteor Lake
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https://bugs.launchpad.net/bugs/2091746
Title:
Unknown display in 6.8.0-50-generic (Ubuntu 24.04.1 LTS)
Status in linux package in Ubuntu:
Confirmed
Bug description:
After upgrading my system (kernel version 6.8.0-50-generic), a phantom
display appeared in the display settings.
1. A third "Unknown 24"" in display settings & "None-1" via xrandr
display appears alongside my built-in laptop display and my external
monitor (connected via thunderbolt 4)
2. That phantom display is functional (i can drag window to it) but
does not correspond to any physical monitor.
3. Issue persists even after disconnecting external monitor and
rebooting, leaving only built-in and phantom displays
Attempts to fix:
1. Tried disabling phantom display with "xrandr --output None-1 --off",
failed with error:
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 139 (RANDR)
Minor opcode of failed request: 7 (RRSetScreenSize)
Serial number of failed request: 27
Current serial number in output stream: 29
2. Reinstalled drivers and reset display configurations (no effect).
3. Booting into the previous kernel (6.8.0-49-generic) resolves the issue.
Expected behavior:
Only the built-in display and the external monitor should appear.
Steps to reproduce:
1. Update to kernel 6.8.0-50-generic.
2. Connect an external monitor via Thunderbolt 4.
3. Check the display settings (Settings > Display).
Hardware:
Laptop: Lenovo ThinkPad T14s gen 5 (intel core ultra 7 155U)
Built-in display: eDP-1 (1920x1200)
External display: LENOVO ThinkVision P24h-30 (connected via Thunderbolt 4)
I guess all logs is delivered via ubuntu-bug command
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-50-generic 6.8.0-50.51
ProcVersionSignature: Ubuntu 6.8.0-50.51-generic 6.8.12
Uname: Linux 6.8.0-50-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/seq: cs 2422 F.... pipewire
/dev/snd/controlC0: cs 2422 F.... pipewire
cs 2427 F.... wireplumber
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Dec 13 22:29:55 2024
InstallationDate: Installed on 2024-11-25 (18 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
MachineType: LENOVO 21LTS07700
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB:
0 simpledrmdrmfb
1 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-50-generic
root=UUID=9b33c6e0-ee77-42a3-8ae5-41e8eafab0a9 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.8.0-50-generic N/A
linux-backports-modules-6.8.0-50-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.5
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/07/2024
dmi.bios.release: 1.7
dmi.bios.vendor: LENOVO
dmi.bios.version: N46ET17W (1.07 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21LTS07700
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.4
dmi.modalias:
dmi:bvnLENOVO:bvrN46ET17W(1.07):bd08/07/2024:br1.7:efr1.4:svnLENOVO:pn21LTS07700:pvrThinkPadT14sGen5:rvnLENOVO:rn21LTS07700:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21LT_BU_Think_FM_ThinkPadT14sGen5:
dmi.product.family: ThinkPad T14s Gen 5
dmi.product.name: 21LTS07700
dmi.product.sku: LENOVO_MT_21LT_BU_Think_FM_ThinkPad T14s Gen 5
dmi.product.version: ThinkPad T14s Gen 5
dmi.sys.vendor: LENOVO
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