Xrandr and external monitor

[H]

On January 1, 2025 5:53:06 PM EST, Fungal-net <fungalnet at protonmail.com> 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.
>
>Are both ends of the cable hdmi, no adaptors?  Usually hdmi - hdmi or
>dp - dp seem pretty accurate, while when you go from one to the other
>they are a bit unreliable.  Is the monitor on before you boot, or are
>you connecting while the system has booted?
>
>Pretty much all guis use xrandr output.  Since you are not listing the
>make and model of the monitor do a search and see if firmware are
>available specific to this monitor.  Also which kernel are you using
>(different versions tend to behave a little different).  
>In most cases the chipset in the monitor provides the firmware needed
>to properly identify itself in the system, but I've seen many
>deviations.  Do you also have svga plugs on both?  
>
>Last question, are gfx native intel/amd or is there something like
>nvidia involved?  It is not a good day to be mean to a stranger but
>tomorrow I may say "ask nvidia then "  :)

Thank you for your quick reply. Yes, I am using an HDMI-HDMI cable with no adapters. I have tried bot booting with the external monitor already attached and attaching/reattaching it later. No SVGA plugs.

The monitor is an Acer S230HL monitor.

I am using the nouveau driver and inxi reports the presence of both Intel UHD Graphics 620 and Nvidia GM108M (GeForce 940MX).