distorted display on 4K TV with xserver-xorg-video-intel

[SeijiSensei]

I have a mini-PC with an Intel N5105 Celeron CPU and a Jasper Lake 24 GPU ("Gen11"). It is connected with HDMI to a Hisense 4K TV. Up until recently, I had no problem installing Kubuntu 22.04 and setting its display resolution to 1280x720. I would see my normal desktop with the panel at the bottom.

Now if I select any resolution <4K the screen is distorted vertically and the panel does not appear at the bottom. I've tried both 1920x1080 and 1280x720 and had the same problem. Tried a couple of 4:3 options; they didn't help.

I then tried Kubuntu 23.04 and 23.10. The problem persists with both these distributions which leads me to think it may be a problem with the graphics driver.

1) Kubuntu 22.04.2

2) xserver-xorg-video-intel:
  Installed: 2:2.99.917+git20210115-1
  Candidate: 2:2.99.917+git20210115-1
  Version table:
 *** 2:2.99.917+git20210115-1 500
        500 http://us.archive.ubuntu.com/ubuntu jammy/main amd64 Packages
        100 /var/lib/dpkg/status

3) Desktop should fit the screen properly at an 16:9 resolution.

4) Screen appears too tall to fit the desktop. The Panel is off the screen below the bottom.

[SeijiSensei (ubuntuforums-2)]

This device has dual display ports. I tried the other one using the 23.10 boot medium in live mode. Same problem.