You probably need to file it upstream at bugs.freedesktop.org (DRI;
DRM/Intel)

** Package changed: xorg (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1793837

Title:
  xorg gives low resolution on HDMI port

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This is a Zotac CI547 box. It has to video outputs: one HDMI and one
  DisplayPort. The HDMI port appears as DP-1 in the logs, the
  DisplayPort as DP-2. The hardware is Intel HD 620 and is allegedly
  able to run two displays simultaneously at 4K. I have one WQHD monitor
  (=2560x1440) and I get that full resolution over the DisplayPort.
  However, I would like to also get that resolution over the HDMI port
  (in order to connect two identical monitors), but over HDMI I only get
  1024x768. Updating the kernel to the latest 4.18.8 using UKUU made no
  difference.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  Uname: Linux 4.18.8-041808-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.3
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: X-Cinnamon
  Date: Sat Sep 22 00:21:15 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA 
controller])
     Subsystem: Intel Corporation HD Graphics 620 [8086:0000]
  InstallationDate: Installed on 2018-09-19 (2 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  MachineType: ZOTAC ZBOX-CI527/CI547
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.8-041808-generic 
root=UUID=a3c0f54d-b5ae-4a0f-89ec-8e47ad34e2ef ro quiet splash 
acpi_backlight=native pci=nomsi 
resume=UUID=a3c0f54d-b5ae-4a0f-89ec-8e47ad34e2ef resume_offset=34816 
vt.handoff=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/25/2017
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: B331P206
  dmi.board.asset.tag: NA
  dmi.board.name: ZBOX-CI527/CI547
  dmi.board.vendor: ZOTAC
  dmi.board.version: XX
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 9
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrB331P206:bd04/25/2017:svnZOTAC:pnZBOX-CI527/CI547:pvrXX:rvnZOTAC:rnZBOX-CI527/CI547:rvrXX:cvnDefaultstring:ct9:cvrDefaultstring:
  dmi.product.family: NA
  dmi.product.name: ZBOX-CI527/CI547
  dmi.product.sku: NA
  dmi.product.version: XX
  dmi.sys.vendor: ZOTAC
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

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