Public bug reported:
I get artifacts when I connect my laptop (Lenovo X1 7th Gen) to an
external 4k monitor via usb-c->DP.
See the attached screenshot.
This happened after I upgraded to ubuntu 20.04.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
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: Thu Apr 23 22:35:27 2020
DistUpgraded: 2020-04-23 22:04:58,240 DEBUG Running PostInstallScript:
'./xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
nvidia, 440.64, 5.3.0-48-generic, x86_64: installed
nvidia, 440.64, 5.4.0-26-generic, x86_64: installed
v4l2loopback, 0.12.3, 5.3.0-48-generic, x86_64: installed
v4l2loopback, 0.12.3, 5.4.0-26-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
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 2019-10-07 (199 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
MachineType: LENOVO 20QDCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-26-generic
root=UUID=298d5179-f5b4-410d-aafb-92630b5b48a1 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to focal on 2020-04-23 (0 days ago)
dmi.bios.date: 03/18/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N2HET47W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20QDCTO1WW
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.modalias:
dmi:bvnLENOVO:bvrN2HET47W(1.30):bd03/18/2020:svnLENOVO:pn20QDCTO1WW:pvrThinkPadX1Carbon7th:rvnLENOVO:rn20QDCTO1WW:rvrSDK0J40697WIN: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 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 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
2:2.99.917+git20200226-1
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 corruption focal ubuntu
** Attachment added: "Photo of my 4K monitor showing artifacts across the
screen."
https://bugs.launchpad.net/bugs/1874543/+attachment/5358684/+files/JPEG_20200423_224126_7817877165177205064.jpg
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https://bugs.launchpad.net/bugs/1874543
Title:
Artifacts when connected to an external 4K display
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