Quoc Khanh Le, thank you for reporting this and helping make Ubuntu better. Please answer all of the following:
1) To advise, you are using an unsupported version of Ubuntu (18.10, EOL July 18, 2019). For more on this, please see https://wiki.ubuntu.com/Releases . Please upgrade to a supported version. Once done, please then run the following commmand once in a terminal to attach debugging information: apport-collect 1837682 2) To confirm, the 'Displaylink Dell 4-in-1 adapter' you have is the 'Dell Adapter - USB 3.0 to HDMI/VGA/Ethernet/USB 2.0 Model: DA100' noted in https://www.dell.com/support/home/us/en/04/product-support/product /dell-universal-dongle-da100/docs ? 3) To clarify what is the earliest version of all the following you tested that reproduced this problem: 3a. the DisplayLink driver 3b. Ubuntu (e.g. tried 14.04 x64 same hardware, same problem) 4) To confirm, the problem is reproducible via either USB port on your laptop? 5) What is the full manufacturer and model of the second monitor? 6) Does this also happen if you use the HDMI port on the Dell 4-in-1 adapter instead of VGA? 7) Does the issue happen if you bypass the Dell 4-in-1 adapter and connect the laptop directly to the second monitor? 8) To confirm a WORKAROUND if you use GNOME Flashback (Metacity) session instead of KDE is the problem reproducible? 9) To see if this is already resolved in Ubuntu, could you please test http://cdimage.ubuntu.com/daily-live/current/ and advise to the results? ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1837682 Title: [Dell XPS 13 9350] Mouse cursor flickers when connecting to 2nd monitor using Displaylink Dell 4-in-1 adapter Status in linux package in Ubuntu: Incomplete Bug description: When my laptop is connected to a second monitor via the VGA port on the Dell 4-in-1 adapter, the mouse cursor flickers. DisplayLink driver 5.2.14 is used. WORKAROUND: As per https://github.com/DisplayLink/evdi/issues/29#issuecomment-479529359 add to file: /usr/share/X11/xorg.conf.d/21-displaylink.conf the following and reboot: Section "Device" Identifier "DisplayLink" Driver "modesetting" Option "PageFlip" "false" EndSection ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-25-generic 4.18.0-25.26 ProcVersionSignature: Ubuntu 4.18.0-25.26-generic 4.18.20 Uname: Linux 4.18.0-25-generic x86_64 ApportVersion: 2.20.10-0ubuntu13.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: qkle 1758 F.... pulseaudio /dev/snd/controlC0: qkle 1758 F.... pulseaudio /dev/snd/pcmC0D0c: qkle 1758 F...m pulseaudio CurrentDesktop: KDE Date: Wed Jul 24 11:54:16 2019 InstallationDate: Installed on 2018-11-22 (243 days ago) InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: Dell Inc. XPS 13 9350 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-25-generic root=UUID=c68d8a53-b2fe-4f1b-8cd3-b52cc8908400 ro quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.18.0-25-generic N/A linux-backports-modules-4.18.0-25-generic N/A linux-firmware 1.175.6 SourcePackage: linux UpgradeStatus: Upgraded to cosmic on 2019-03-19 (126 days ago) dmi.bios.date: 08/31/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.9.0 dmi.board.name: 07TYC2 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.9.0:bd08/31/2018:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn07TYC2:rvrA01:cvnDellInc.:ct9:cvr: dmi.product.family: NULL dmi.product.name: XPS 13 9350 dmi.product.sku: 0704 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1837682/+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
