Public bug reported:
Description:
After upgrading from Linux kernel 5.15.0-161 to 5.15.0-163, two external
monitors connected to an NVIDIA Quadro T2000 GPU are no longer detected by the
system.
System Information:
Kernel: 5.15.0-163-generic
GPU: NVIDIA Quadro T2000 (TU117GL-A)
Driver: nvidia 580.95.05
Display Manager: GDM (GNOME Display Manager)
Observed Behavior:
With kernel 5.15.0-163, the journalctl logs show that display ports DFP-0 and
DFP-2 are marked as disconnected, while the two monitors were previously
working correctly on kernel 5.15.0-161.
Current detection status in 5.15.0-163:
DFP-0: disconnected (Internal DisplayPort)
DFP-1: disconnected (Internal DisplayPort)
DFP-2: disconnected (Internal TMDS)
DFP-3: connected (RTK J560J10 - TMDS) ✓
DFP-4: connected (BOE Technology Group - DisplayPort) ✓
DFP-5: disconnected (Internal DisplayPort)
Regression:
Kernel 5.15.0-161 detects all displays correctly. The issue appears to be a
kernel regression between these two versions.
Workaround:
Reverting to kernel 5.15.0-161-generic resolves the issue completely.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-163-generic 5.15.0-163.173
ProcVersionSignature: Ubuntu 5.15.0-163.173-generic 5.15.193
Uname: Linux 5.15.0-163-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.10
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun Dec 7 16:42:45 2025
InstallationDate: Installed on 2020-03-10 (2098 days ago)
InstallationMedia: Ubuntu-Server 18.04.4 LTS "Bionic Beaver" - Release amd64
(20200203.1)
MachineType: LENOVO 20QNCTO1WW
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-163-generic
root=/dev/mapper/vg0-lv--0 ro
RelatedPackageVersions:
linux-restricted-modules-5.15.0-163-generic N/A
linux-backports-modules-5.15.0-163-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.40
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/27/2020
dmi.bios.release: 1.26
dmi.bios.vendor: LENOVO
dmi.bios.version: N2NET41W (1.26 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20QNCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.9
dmi.modalias:
dmi:bvnLENOVO:bvrN2NET41W(1.26):bd10/27/2020:br1.26:efr1.9:svnLENOVO:pn20QNCTO1WW:pvrThinkPadP53:rvnLENOVO:rn20QNCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20QN_BU_Think_FM_ThinkPadP53:
dmi.product.family: ThinkPad P53
dmi.product.name: 20QNCTO1WW
dmi.product.sku: LENOVO_MT_20QN_BU_Think_FM_ThinkPad P53
dmi.product.version: ThinkPad P53
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy
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https://bugs.launchpad.net/bugs/2134339
Title:
Kernel 5.15.0-163: Display detection broken on NVIDIA Quadro T2000
with two external monitors
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