Possible nouveau driver problem?

[Ilia Mirkin]

On Thu, Aug 15, 2024 at 8:29 PM H <agents at meddatainc.com> wrote:

> I am running Rocky Linux latest version with the Mate Desktop 1.26.2 (the
> latest version in the EPEL repository) on a Dell Inspiron laptop with a
> 3840 x 2160 display and an external 1920 x 1080 Acer
> monitor connected via HDMI, see output below:
>
> $ inxi --graphics
> Graphics:
>   Device-1: Intel UHD Graphics 620 driver: i915 v: kernel
>   Device-2: NVIDIA GM108M [GeForce 940MX] driver: nouveau v: kernel
>   Device-3: DisplayLink Dell D3100 Docking Station driver: usbfs type: USB
>   Device-4: Realtek Integrated_Webcam_HD driver: uvcvideo type: USB
>   Display: x11 server: X.Org v: 1.20.11 driver: X: loaded: modesetting
>     dri: iris gpu: i915 resolution: 1: 1920x1080~60Hz 2: 3840x2160~60Hz
>   API: OpenGL v: 4.6 vendor: intel mesa v: 23.3.3 renderer: Mesa Intel UHD
>     Graphics 620 (KBL GT2)
>
> The problem is that the external display has some issues, whether they are
> related to the nouveau driver, the Mate Desktop or something else I cannot
> determine. What happens is that although the
> external monitor is indeed using the 1920 x 1080 resolution and dragging a
> window from the laptop screen to the external screen works, ie., it
> maintains the "correct" size, then maximizing it makes it
> 1/4 of the size of the external monitor display. Likewise, the Mate
> Desktop background repeats partly 4-fold on this monitor, partly 16-fold...
>
> I also have a Dell docking station, model D3100 and have downloaded the
> latest DisplayLink driver from github with the hope that I could attach two
> external Acer monitors to use with the laptop, I
> unable to use xrandr to correctly set the external monitor (I have only
> tried with one so far) to the desired 1920 x 1080 resolution while
> maintaining the 3840 x 2160 resolution on the laptop screen.
>
> Googling suggests that there might be some issues with xrandr and scaling
>
> Given my description above, could there possibly be a bug in the nouveau
> driver I am using?
>

What makes you say that nouveau (or the NVIDIA GPU) is in any way involved
in your issue?

GM108 is, per my recollection, an accelerator-only GPU. It seems like both
of your outputs are being driven by the integrated Intel GPU, as is your
acceleration.

Confirming which device is driving what will go a long way to helping
understand your issues.

Cheers,

  -ilia
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