On Thu, Aug 15, 2024 at 8:29 PM H <agents@xxxxxxxxxxxxxx> 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
