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

[Akkana Peck]

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

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1421808 / bug 1787332 / bug 1787338, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.