With new packages,this issue is fixed on ThinkPad P16.

Commandline: apt install xserver-common xserver-xephyr xserver-xorg-core 
xserver-xorg-legacy
Requested-By: u (1001)
Upgrade: xserver-xorg-core:amd64 (2:21.1.3-2ubuntu2.1, 2:21.1.3-2ubuntu2.2), 
xserver-xorg-legacy:amd64 (2:21.1.3-2ubuntu2.1, 2:21.1.3-2ubuntu2.2), 
xserver-common:amd64 (2:21.1.3-2ubuntu2.1, 2:21.1.3-2ubuntu2.2), 
xserver-xephyr:amd64 (2:21.1.3-2ubuntu2.1, 2:21.1.3-2ubuntu2.2)
End-Date: 2022-09-28  05:15:30

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1990456

Title:
  xorg reports bogus 1600x1024 resolution

Status in OEM Priority Project:
  New
Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Jammy:
  Fix Committed

Bug description:
  xorg reports 1600x1024 bogus resolution

  [ Impact ]

   * User of NVIDIA GPU is able to switch to 1600x1024 resolution but
  cannot display anything under the resolution

  [ Fix ]

  Drop 001_fedora_extramodes.patch which was dropped from Fedora since
  xserver 1.5.0.

  [ Test Plan ]

  1. Find a test unit with NVIDIA GPU, or anything but use Xorg mode to enter 
the desktop
  2. Type `xrandr` in terminal

  Expected: The resolution 1600x1024 should not appear if the display does not 
support it.
  Actual: The resolution 1600x1024 appears.

  [ Where problems could occur ]

   * Lack of extra modes that the display might actually support.

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