Please test latest drm-tip kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/current/

And file a bug agains Intel graphics if the issue persists:
https://gitlab.freedesktop.org/drm/intel/wikis/How-to-file-i915-bugs

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https://bugs.launchpad.net/bugs/1901470

Title:
  [modeset][i915] Native resolution (EDID detailed mode) of 2560x1440
  not listed, defaults to 1920x1080 instead

Status in linux package in Ubuntu:
  Confirmed
Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  The PG278QR monitor supports 2560x1440.  After installing Ubuntu 20.4,
  the max resolution presented in the Settings app is 1920x1080, and
  this resolution is the one that it uses.  Switching between the Nvidia
  driver or the Intel driver (laptop has low-power intel gpu too)
  doesn't correct the problem.

  Digging in deeper, based on
  
https://wiki.ubuntu.com/X/Troubleshooting/Resolution#Problem:__Wrong_resolutions.2C_refresh_rates.2C_or_monitor_specs

  Under Wrong resolutions/refresh rates/or monitor specs, step 3 is to
  use get-edid | parse-edid.

  After applying the mode that I wanted manually via xrandr --newmode
  and xrandr --addmode, I was able to select the max resolution of the
  monitor and works correctly, until reboot.  I will add it to my
  xorg.conf next.

  Here is information I collected:

  output from xrandr after fresh boot:

  ~$ xrandr
  Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
  eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y 
axis) 344mm x 193mm
     1920x1080     60.01*+  60.01    59.97    59.96    59.93  
     1680x1050     59.95    59.88  
     1600x1024     60.17  
     1400x1050     59.98  
     1600x900      59.99    59.94    59.95    59.82  
     1280x1024     60.02  
     1440x900      59.89  
     1400x900      59.96    59.88  
     1280x960      60.00  
     1440x810      60.00    59.97  
     1368x768      59.88    59.85  
     1360x768      59.80    59.96  
     1280x800      59.99    59.97    59.81    59.91  
     1152x864      60.00  
     1280x720      60.00    59.99    59.86    59.74  
     1024x768      60.04    60.00  
     960x720       60.00  
     928x696       60.05  
     896x672       60.01  
     1024x576      59.95    59.96    59.90    59.82  
     960x600       59.93    60.00  
     960x540       59.96    59.99    59.63    59.82  
     800x600       60.00    60.32    56.25  
     840x525       60.01    59.88  
     864x486       59.92    59.57  
     800x512       60.17  
     700x525       59.98  
     800x450       59.95    59.82  
     640x512       60.02  
     720x450       59.89  
     700x450       59.96    59.88  
     640x480       60.00    59.94  
     720x405       59.51    58.99  
     684x384       59.88    59.85  
     680x384       59.80    59.96  
     640x400       59.88    59.98  
     576x432       60.06  
     640x360       59.86    59.83    59.84    59.32  
     512x384       60.00  
     512x288       60.00    59.92  
     480x270       59.63    59.82  
     400x300       60.32    56.34  
     432x243       59.92    59.57  
     320x240       60.05  
     360x202       59.51    59.13  
     320x180       59.84    59.32  
  HDMI-1-1 connected 1920x1080+1920+0 (normal left inverted right x axis y 
axis) 598mm x 336mm
     1920x1080     60.00*   50.00    59.94  
     1280x720      60.00    50.00    59.94  
     1024x768      60.00  
     800x600       60.32  
     720x576       50.00  
     720x480       60.00    59.94  
     640x480       60.00    59.94  
  DP-1-1 disconnected (normal left inverted right x axis y axis)

  output from get-edid | parse-edid:
  ~$ sudo get-edid | parse-edid
  This is read-edid version 3.0.2. Prepare for some fun.
  Attempting to use i2c interface
  No EDID on bus 1
  No EDID on bus 2
  No EDID on bus 3
  No EDID on bus 5
  No EDID on bus 6
  No EDID on bus 7
  No EDID on bus 9
  No EDID on bus 10
  3 potential busses found: 0 4 8
  Will scan through until the first EDID is found.
  Pass a bus number as an option to this program to go only for that one.
  Bus 0 doesn't really have an EDID...
  256-byte EDID successfully retrieved from i2c bus 4
  Looks like i2c was successful. Have a good day.
  Checksum Correct

  Section "Monitor"
        Identifier "ROG PG278QR"
        ModelName "ROG PG278QR"
        VendorName "AUS"
        # Monitor Manufactured week 47 of 2016
        # EDID version 1.3
        # Digital Display
        DisplaySize 600 340
        Gamma 2.20
        Option "DPMS" "false"
        Horizsync 30-140
        VertRefresh 24-60
        # Maximum pixel clock is 300MHz

        #Extension block found. Parsing...
        Modeline        "Mode 1" 148.500 1920 2008 2052 2200 1080 1084 1089 
1125 +hsync +vsync
        Modeline        "Mode 0" 241.50 2560 2608 2640 2720 1440 1443 1448 1481 
+hsync -vsync 
        Modeline        "Mode 2" 148.500 1920 2448 2492 2640 1080 1084 1089 
1125 +hsync +vsync
        Modeline        "Mode 3" 74.250 1280 1390 1420 1650 720 725 730 750 
+hsync +vsync
        Modeline        "Mode 4" 74.250 1280 1720 1760 1980 720 725 730 750 
+hsync +vsync
        Modeline        "Mode 5" 27.027 720 736 798 858 480 489 495 525 -hsync 
-vsync
        Modeline        "Mode 6" 27.000 720 732 796 864 576 581 586 625 -hsync 
-vsync
        Modeline        "Mode 7" 25.200 640 656 752 800 480 490 492 525 -hsync 
-vsync
        Option "PreferredMode" "Mode 1"
  EndSection

  "Mode 0" above is the mode that I want to use, which doesn't appear in
  the Settings app list of available resolutions.

  I used "Mode 0" to via xrandr --newmode:
  ~$ xrandr --newmode "Mode 0" 241.50 2560 2608 2640 2720 1440 1443 1448 1481 
+hsync -vsync

  Then, xrandr --addmode:
  ~$ xrandr --addmode HDMI-1-1 "Mode 0"

  Then in Settings app, I can select the 2560x1440 resolution for the ASUS 
PG278QR display.
  --- 
  ProblemType: Bug
  .proc.driver.nvidia.capabilities.gpu0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/capabilities/gpu0'
  .proc.driver.nvidia.capabilities.mig: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/capabilities/mig'
  .proc.driver.nvidia.gpus.0000.02.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:02:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.suspend: suspend hibernate resume
  .proc.driver.nvidia.suspend_depth: default modeset uvm
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  450.80.02  Wed Sep 23 
01:13:39 UTC 2020
   GCC version:  gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
  ApportVersion: 2.20.11-0ubuntu27.10
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroRelease: Ubuntu 20.04
  DistroVariant: ubuntu
  DkmsStatus: nvidia, 450.80.02, 5.4.0-52-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (prog-if 00 
[VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] UHD Graphics 620 
(Whiskey Lake) [1462:126c]
     Subsystem: Micro-Star International Co., Ltd. [MSI] GP107M [GeForce GTX 
1050 Mobile] [1462:126c]
  InstallationDate: Installed on 2019-04-11 (565 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  MachineType: Micro-Star International Co., Ltd. PS63 Modern 8RC
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: xorg-server (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-52-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 5.4.0-52.57-generic 5.4.65
  Tags:  focal ubuntu
  Uname: Linux 5.4.0-52-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: dialout plugdev sudo tty uucp
  _MarkForUpload: True
  dmi.bios.date: 12/24/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: E16S1IMS.106
  dmi.board.asset.tag: Default string
  dmi.board.name: MS-16S1
  dmi.board.vendor: Micro-Star International Co., Ltd.
  dmi.board.version: REV:1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Micro-Star International Co., Ltd.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrE16S1IMS.106:bd12/24/2018:svnMicro-StarInternationalCo.,Ltd.:pnPS63Modern8RC:pvrREV1.0:rvnMicro-StarInternationalCo.,Ltd.:rnMS-16S1:rvrREV1.0:cvnMicro-StarInternationalCo.,Ltd.:ct10:cvrN/A:
  dmi.product.family: PS
  dmi.product.name: PS63 Modern 8RC
  dmi.product.sku: 16S1.1
  dmi.product.version: REV:1.0
  dmi.sys.vendor: Micro-Star International Co., Ltd.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.8-0ubuntu1~20.04.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.4
  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

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