Xrandr and external monitor

[H]

On January 2, 2025 11:58:06 AM EST, Alan Coopersmith <alan.coopersmith at oracle.com> wrote:
>On 1/1/25 12:27, H wrote:
>> I just discovered running xrandr --listmonitors that, while the
>internal laptop monitor is labeled eDP-1, xrandr identifies the
>external monitor as using DP-1 although it uses the laptop
>HDMI-connector. Further, while mate hardware display monitor also
>identifies it as using DP-1 - possibly based on xrandr output - the
>monitor itself tells me it is connected using its HDMI1 connector.
>xrandr does report the correct display resolution, though.
>> 
>> Thus, it looks like xrandr misreads the configuration feeding it to
>mate. 
>
>The xrandr program and GUIs like the mate monitor configuration use
>libXrandr to
>get the configuration information - all it does is ask the Xserver for
>the
>information provided by the video driver.  If these programs are
>showing the
>wrong config it's because the Xorg video driver module has provided
>them with
>the wrong information.  (You don't say what Xorg video driver you're
>using
>- modesetting or something more specific to the hardware - the
>Xorg.0.log
>should list that and may list the output config detected by it.)

So the problem could lie with x or with the video driver, the latter reporting to X? According to X.org.log I am running X Server 1.20.11.

One of my concerns is why X reports that DP-1 connection is used with the external monitor whereas it in reality uses HDMI without any adapters. That suggests something is reported incorrectly which could conceivably lead to some other problem.

I am attaching X.org.log which to me seems to suggest that it is using the noveau driver. Note that I just tried to disconnect/reconnect the external monitor but could not find any log of that connection towards the end of the log.