apport information ** Attachment added: "CurrentDmesg.txt" https://bugs.launchpad.net/bugs/1936868/+attachment/5520237/+files/CurrentDmesg.txt
-- 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/1936868 Title: monitor flickers when input is changed back Status in linux package in Ubuntu: Incomplete Bug description: Hi there! I have a Lenovo Carbon X1 and I use an external HP Z27 4K monitor. I have the monitor connected to the Lenovo laptop using a HDMI cable. I also have the same monitor connected to a Dell desktop computer using a DP cable. I can change the selected input on the monitor from HDMI (laptop) to DP (desktop). The problem is that when I change it back, both the external monitor AND the laptop screen flicker as if I had physically plugged in the monitor. Checking dmesg, I'm getting the following messages: ``` [616849.330989] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] *ERROR* Unexpected DP dual mode adaptor ID 50 [616853.593595] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] *ERROR* Unexpected DP dual mode adaptor ID 50 ``` Sometimes I get back my desktop, but more often then not the external monitor is stuck as 1920*1080 and I have to use `autorandr` to fix that. ``` lsb_release -rd Description: Ubuntu 21.04 Release: 21.04 ``` ``` uname -a Linux my-laptop 5.11.0-22-generic #23-Ubuntu SMP Thu Jun 17 00:34:23 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ``` --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: leo 116787 F.... pulseaudio CasperMD5CheckResult: pass CurrentDesktop: KDE DistroRelease: Ubuntu 21.04 InstallationDate: Installed on 2021-07-12 (42 days ago) InstallationMedia: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420) MachineType: LENOVO 20QD001UUS Package: linux (not installed) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-31-generic root=/dev/mapper/vgkubuntu-root ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.11.0-31.33-generic 5.11.22 RelatedPackageVersions: linux-restricted-modules-5.11.0-31-generic N/A linux-backports-modules-5.11.0-31-generic N/A linux-firmware 1.197.3 Tags: hirsute Uname: Linux 5.11.0-31-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: 09/11/2019 dmi.bios.release: 1.20 dmi.bios.vendor: LENOVO dmi.bios.version: N2HET37W (1.20 ) dmi.board.asset.tag: Not Available dmi.board.name: 20QD001UUS dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.10 dmi.modalias: dmi:bvnLENOVO:bvrN2HET37W(1.20):bd09/11/2019:br1.20:efr1.10:svnLENOVO:pn20QD001UUS:pvrThinkPadX1Carbon7th:rvnLENOVO:rn20QD001UUS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad X1 Carbon 7th dmi.product.name: 20QD001UUS dmi.product.sku: LENOVO_MT_20QD_BU_Think_FM_ThinkPad X1 Carbon 7th dmi.product.version: ThinkPad X1 Carbon 7th dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1936868/+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
