Xrandr and external monitor

[H]

On January 1, 2025 6:20:20 PM EST, H <agents at meddatainc.com> wrote:
>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).

The kernel is:
Linux dell 5.14.0-503.15.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Nov 26 17:24:29 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux