On January 2, 2025 7:51:18 PM GMT-05:00, H <agents@xxxxxxxxxxxxxx> wrote: >On January 1, 2025 9:51:30 PM EST, H <agents@xxxxxxxxxxxxxx> wrote: >>Running the latest version of Rocky Linux 9 fully updated and Mate on >a >>Dell Inspiron 7570 laptop with a UHD display, i.e. 3840 x 2160 pixels. >>I would like to attach two external monitors and initially >experimented >>with a Dell dock model 3100 and the latest version of the DisplayLink >>and evdi drivers. However, although the Mate display applet shows the >>correct resolution for the laptop display itself and for the external >>monitor which is running at 1920 x 1080 pixels, the resolution on the >>second, external display is more like 640 x 480 pixels. >> >>While I initially thought this was due to a bug in the >DisplayLink/evdi >>drivers, I see the same issue when I connect the monitor directly to >>the HDMI output on the laptop itself, ie. DisplayLink/evdi are >>presumably not involved although they are installed, nor is the dock >of >>course. >> >>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/nouveau misreads the configuration feeding >>it to mate. I just updated the laptop BIOS to the very latest version >>and saw no difference. >> >>I am using an HDMI-HDMI cable with no adapters. I have tried both >>booting with the external monitor already attached and >>attaching/reattaching it later. 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 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 >> >>Could this be an nouveau bug (I am running X11 and not Wayland)? How >>should I troubleshoot it? >> >>Appreciate ideas! > >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 Any suggestions as to how I could find the cause of this bug?
