HDMI port not recognized on Vivobook S 16 Flip

[kalpana]

I have a new Asus Vivobook S 16 Flip, with kubuntu 22.04 installed.
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uname -r
5.15.0-79-generic
It has an HDMI port, but the port is not detected. It does not even show up with xrandr
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xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1200, current 1920 x 1200, maximum 1920 x 1200
default connected primary 1920x1200+0+0 0mm x 0mm
   1920x1200     77.00*
The graphics card is intel iris Xe:
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$ lspci -nn |grep  -Ei 'VGA|DISPLAY'
00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:a7a0] (rev 04)
According to this website https://dgpu-docs.intel.com/devices/hardware-table.html, the driver is under active development. I found this website, https://dgpu-docs.intel.com/devices/...ics/index.html, but while it talks about both Iris Xe and Iris Xe Max, it is for Ubuntu 20.04.1. It is not clear to me if it still applies to 22.04. If it does apply to 22.04, it is not clear to me that I need to do the steps pertaining to the Xe Max specifically (which I do not have). I also tried
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sudo dmesg | grep HDMI 
[    0.300704] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
so at least HDMI audio seems to be supported. Does anyone have suggestions? Thank you.