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!
On Wed, Jan 1, 2025 at 9:57?PM H <agents at meddatainc.com> 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? >No, this could not be a nouveau bug. I'm fairly sure that the GM108 is a pure accelerator, so your screen is being connected to not-the-nvidia board (either Intel or the USB DisplayLink thing). Your Xorg log should generally have more useful info. Cheers, -ilia -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20250102/a64c4fa0/attachment.htm>
On January 1, 2025 9:51:30 PM EST, H <agents at meddatainc.com> 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 -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: Xorg.0.log URL: <https://lists.freedesktop.org/archives/nouveau/attachments/20250102/33494db6/attachment-0001.ksh>