Public bug reported:

Every now and then, maybe one time out of 8, resuming from suspend gives
me a black screen, no X.

If I try ctrl-alt-F7, I see a VT with a _ on it, no X or login prompt.
If I try ctrl-alt-F1, F2, F2 or F4, X crashes, every time.

I've collected X logs from the last two times this has happened; both times, 
there's a message near the end:
EnterVT failed for screen 0

I found a similar but not identical upstream bug: that might be related:
https://bugs.freedesktop.org/show_bug.cgi?id=109668
There's also a Redhat bug that looks related and might have helpful info:
https://bugzilla.redhat.com/show_bug.cgi?id=1662057

Machine is a Levono Carbon X1 with Intel graphics (hopefully ubuntu-bug
attached the relevant info).

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
Date: Mon Nov 11 19:51:13 2019
DistUpgraded: Fresh install
DistroCodename: eoan
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 6.0.14, 5.3.0-18-generic, x86_64: installed
 virtualbox, 6.0.14, 5.3.0-19-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) 
(prog-if 00 [VGA controller])
   Subsystem: Lenovo UHD Graphics 620 (Whiskey Lake) [17aa:2292]
InstallationDate: Installed on 2019-10-10 (32 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Beta amd64 (20190926.1)
MachineType: LENOVO 20QDCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-19-generic 
root=UUID=a5868be6-8495-47af-a190-9af5fdc9b419 ro
SourcePackage: xorg
Symptom: display
Title: Xorg crash
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/04/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: N2HET30W (1.13 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20QDCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40700 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN2HET30W(1.13):bd07/04/2019:svnLENOVO:pn20QDCTO1WW:pvrThinkPadX1Carbon7th:rvnLENOVO:rn20QDCTO1WW:rvrSDK0J40700WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 7th
dmi.product.name: 20QDCTO1WW
dmi.product.sku: LENOVO_MT_20QD_BU_Think_FM_ThinkPad X1 Carbon 7th
dmi.product.version: ThinkPad X1 Carbon 7th
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.99-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20190815-1
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 crash eoan ubuntu

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1852158

Title:
  Xorg black screen on resume, and VT switch crashes with "EnterVT
  failed for screen 0"

Status in xorg package in Ubuntu:
  New

Bug description:
  Every now and then, maybe one time out of 8, resuming from suspend
  gives me a black screen, no X.

  If I try ctrl-alt-F7, I see a VT with a _ on it, no X or login prompt.
  If I try ctrl-alt-F1, F2, F2 or F4, X crashes, every time.

  I've collected X logs from the last two times this has happened; both times, 
there's a message near the end:
  EnterVT failed for screen 0

  I found a similar but not identical upstream bug: that might be related:
  https://bugs.freedesktop.org/show_bug.cgi?id=109668
  There's also a Redhat bug that looks related and might have helpful info:
  https://bugzilla.redhat.com/show_bug.cgi?id=1662057

  Machine is a Levono Carbon X1 with Intel graphics (hopefully ubuntu-
  bug attached the relevant info).

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: xorg 1:7.7+19ubuntu12
  ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
  Uname: Linux 5.3.0-19-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CompositorRunning: None
  Date: Mon Nov 11 19:51:13 2019
  DistUpgraded: Fresh install
  DistroCodename: eoan
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 6.0.14, 5.3.0-18-generic, x86_64: installed
   virtualbox, 6.0.14, 5.3.0-19-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) 
(prog-if 00 [VGA controller])
     Subsystem: Lenovo UHD Graphics 620 (Whiskey Lake) [17aa:2292]
  InstallationDate: Installed on 2019-10-10 (32 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Beta amd64 (20190926.1)
  MachineType: LENOVO 20QDCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-19-generic 
root=UUID=a5868be6-8495-47af-a190-9af5fdc9b419 ro
  SourcePackage: xorg
  Symptom: display
  Title: Xorg crash
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/04/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N2HET30W (1.13 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20QDCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40700 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN2HET30W(1.13):bd07/04/2019:svnLENOVO:pn20QDCTO1WW:pvrThinkPadX1Carbon7th:rvnLENOVO:rn20QDCTO1WW:rvrSDK0J40700WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 7th
  dmi.product.name: 20QDCTO1WW
  dmi.product.sku: LENOVO_MT_20QD_BU_Think_FM_ThinkPad X1 Carbon 7th
  dmi.product.version: ThinkPad X1 Carbon 7th
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.99-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 19.2.1-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.5+git20191008-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-1ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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