It is super snappy but doesn't work any better: one of the external monitors, or the other but not both.
I'm unfamiliar with Wayland, and Googling around has not found any equivalent tools to xrandr to let me interrogate what the system thinks is going on, so I've included a screenshot of the displays control panel. What further diagnostics would you like me to perform? ** Attachment added: "displays failure" https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1886729/+attachment/5391134/+files/display-failure.png -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1886729 Title: Dell displayport YJ3Y6 adapter doesn't drive 4K screen properly Status in mutter package in Ubuntu: Incomplete Status in xorg-server package in Ubuntu: New Bug description: I have some early dell 4k 60hz screens - the ones which report 2 panels internally for DP 60Hz - horrid hack I know; I recently got a new XPS laptop and put Ubuntu on it. That XPS laptop has two USB-C/thunderbolt ports, so to drive the screens I bought two slightly different DP adapters - one with power passthrough, and a cheaper one that only does DP. The more expensive one 'USB-C to HDMI/DP' drives the monitor happily over DP, though sadly only at 30Hz - can't have everything :/. It reports one monitor as one output: DP-1 in the attached information: DP-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 527mm x 296mm 3840x2160 29.98*+ 30.00 29.97 1920x1200 59.88 ... The cheaper one reports the single monitor as two distinct outputs, at 60hz interestingly - DP-3-8 connected (normal left inverted right x axis y axis) 1920x2160 59.99 + DP-3-9 connected 1920x2160+7680+0 (normal left inverted right x axis y axis) 527mm x 296mm 1920x2160 59.99*+ 1920x1200 59.88 which in theory if summed together would be one whole screen. But attempting to configure the output results in an error: xrandr --output DP-1 --auto --left-of eDP-1 --output DP-3-9 --auto --right-of DP-3-8 --output DP-3-8 --auto --right-of eDP-1 xrandr: cannot find crtc for output DP-3-8 I'm not sure if this is an intrinsic limitation of the USB-C->DP dongle, or whether there is something that can be done in the software to deal with this 10 year old hardware hack I have sitting on my desktop. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44 Uname: Linux 5.4.0-40-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.3 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Wed Jul 8 11:20:17 2020 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation Iris Plus Graphics G7 [8086:8a52] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Dell Iris Plus Graphics G7 [1028:096d] InstallationDate: Installed on 2020-07-07 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Dell Inc. XPS 13 9300 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-40-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/08/2020 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.0.11 dmi.board.name: 0WX9VX dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.0.11:bd05/08/2020:svnDellInc.:pnXPS139300:pvr:rvnDellInc.:rn0WX9VX:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 13 9300 dmi.product.sku: 096D dmi.sys.vendor: Dell Inc. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.101-2 version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1886729/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
