Public bug reported:

My laptop (Lenovo ThinkPad P51) has 2 display interfaces. One mini-dp
and one HDMI. But none of them is shown in xrandr, and my external
display connected through mini-dp is not detected also.

When I used LiveCD, the external monitor works normally. The above
situation happens when my boot from SSD with the fully-installed system.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.64  Fri Feb 21 01:17:26 
UTC 2020
 GCC version:
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Apr 29 21:37:28 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
 Intel Corporation HD Graphics P630 [8086:591d] (rev 04) (prog-if 00 [VGA 
   Subsystem: Lenovo HD Graphics P630 [17aa:224d]
   Subsystem: Lenovo GM206GLM [Quadro M2200 Mobile] [17aa:224d]
InstallationDate: Installed on 2020-04-29 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20HHCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-28-generic 
root=UUID=05a90498-4cfc-4877-8f08-b096eb36e91b ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install) 02/10/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N1UET77W (1.51 )
dmi.board.asset.tag: Not Available 20HHCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi:bvnLENOVO:bvrN1UET77W(1.51):bd02/10/2020:svnLENOVO:pn20HHCTO1WW:pvrThinkPadP51:rvnLENOVO:rn20HHCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone: ThinkPad P51 20HHCTO1WW
dmi.product.sku: LENOVO_MT_20HH_BU_Think_FM_ThinkPad P51
dmi.product.version: ThinkPad P51
dmi.sys.vendor: LENOVO
 ERROR: Unable to load info from any available system
 ERROR: Unable to load info from any available system
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug focal ubuntu

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  Display Interfaces Not Detected

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