I am experiencing the same issue. I have two laptops, one MacBook Air and one Dell Inspiron with Ubuntu 22.04. I constantly need to switch the monitor between these two. I have an HDMI switcher which used to work great on Ubuntu 20.04. But now with Ubuntu 22.04 it is not possible. Ubuntu is able to display the picture on the monitor only after plugging the HDMI in. After I switch to Mac, I am unable to switch back to Ubuntu.
I guess this must have something to do with how KVM and HDMI switchers work. Maybe they don't disconnect the inactive device entirely and, as a result, switching back to Ubuntu does not trigger the same behavior that connecting the HDMI cable does? It's important to note that after switching the HDMI from Ubuntu to Mac, Ubuntu is fully aware that HDMI has been disconnected and the external monitor is not detected. But still it never gets detected again. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2015314 Title: Ubuntu 22.04 does not restore the screen on a KVM switch Status in linux package in Ubuntu: Confirmed Bug description: Ubuntu 22.04 on either of two HP small business PC. 1. an HP EliteDesk 800 G3 Mini PC with an i915 video controller using Displayport to HDMI. 2. an HP 600 G1 desktop SFF with an i915 video controller, also using Displayport to HDMI. Both are connected to a KVM switch. When I boot up I get a login and everything works fine, until I switch between them. No image appears. There is a slight brightening of the display after a few seconds, as if it's trying to enable video output, but I have to unplug and replug the displayport connector at the back of the computer to get the screen to come back. journalctl -k shows these lines logged on the HP 600 G1: Apr 04 20:55:42 demesne kernel: i915 0000:00:02.0: [drm] *ERROR* Unexpected DP dual mode adaptor ID 20 Apr 04 20:55:42 demesne kernel: i915 0000:00:02.0: [drm] *ERROR* Unexpected DP dual mode adaptor ID 20 on the EliteDesk 800 G3, the same message: Apr 04 20:55:58 haven kernel: i915 0000:00:02.0: [drm] *ERROR* Unexpected DP dual mode adaptor ID 20 https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.19/+filebug/e70d8b1a-d357-11ed-b7a8-d485646cd9a4? https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.19/+filebug/26e2b774-d358-11ed-99a2-40a8f0305cb4? Both systems are Ubuntu 22.04.2 LTS --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu82.3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: peter 1719 F.... pulseaudio CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 22.04 InstallationDate: Installed on 2023-04-05 (0 days ago) InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223) MachineType: HP HP EliteDesk 800 G3 DM 35W Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.19.0-38-generic root=UUID=69e670cd-6996-4cc1-bdb0-bdc9e857503e ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.19.0-38.39~22.04.1-generic 5.19.17 RelatedPackageVersions: linux-restricted-modules-5.19.0-38-generic N/A linux-backports-modules-5.19.0-38-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.12 Tags: wayland-session jammy Uname: Linux 5.19.0-38-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 04/27/2020 dmi.bios.release: 2.34 dmi.bios.vendor: HP dmi.bios.version: P21 Ver. 02.34 dmi.board.name: 829A dmi.board.vendor: HP dmi.board.version: KBC Version 06.29 dmi.chassis.type: 35 dmi.chassis.vendor: HP dmi.ec.firmware.release: 6.41 dmi.modalias: dmi:bvnHP:bvrP21Ver.02.34:bd04/27/2020:br2.34:efr6.41:svnHP:pnHPEliteDesk800G3DM35W:pvr:rvnHP:rn829A:rvrKBCVersion06.29:cvnHP:ct35:cvr:sku4DS57UC#ABA: dmi.product.family: 103C_53307F HP EliteDesk dmi.product.name: HP EliteDesk 800 G3 DM 35W dmi.product.sku: 4DS57UC#ABA dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2015314/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
