** Changed in: linux (Ubuntu) Importance: Undecided => Medium -- 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/1566410
Title: screen flickers indefinitely when connecting a display via USB-C Status in linux package in Ubuntu: Confirmed Bug description: Dell XPS 13 Skylake laptop, only external display port is adapter is via USB-C. When connecting any of the adapters I have (eg USB-C to VGA, HDMI, DisplayPort, I tried all and the behavior is the same), the screen starts flickering as if trying to detect something, and then keeps doing this indefinitely. Mouse moves but windows don't react. Can switch to terminal and back with Ctrl-Alt-F1 etc. This only happens with Unity/Gnome. KDE and XFCE4 work fine, just detect the display. It would help greatly as a workaround if I could just disable the part of unity/gnome which tries to detect the new display and use xrandr instead (which, again, works fine with other desktops), but I could not figure out which program that is, or where it writes its logfiles. Using latest xenial packages. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: unity 7.4.0+16.04.20160401.1-0ubuntu1 Uname: Linux 4.4.6-040406-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.20.1-0ubuntu1 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Tue Apr 5 18:06:36 2016 DistUpgraded: 2016-02-27 15:22:35,661 DEBUG enabling apt cron job DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: virtualbox, 5.0.16, 4.4.0-16-generic, x86_64: installed virtualbox, 5.0.16, 4.4.6-040406-generic, x86_64: installed virtualbox, 5.0.16, 4.5.0-040500-generic, x86_64: installed GraphicsCard: Intel Corporation Sky Lake Integrated Graphics [8086:1926] (rev 0a) (prog-if 00 [VGA controller]) Subsystem: Dell Skylake Integrated Graphics [1028:0704] InstallationDate: Installed on 2016-02-26 (39 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 0bda:5682 Realtek Semiconductor Corp. Bus 001 Device 003: ID 04f3:20d0 Elan Microelectronics Corp. Bus 001 Device 002: ID 0a5c:6412 Broadcom Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. XPS 13 9350 ProcEnviron: LANGUAGE=en_US PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.6-040406-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash i915.enable_rc6=0 vt.handoff=7 SourcePackage: unity UpgradeStatus: Upgraded to xenial on 2016-02-27 (38 days ago) dmi.bios.date: 03/01/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.3.3 dmi.board.name: 09JHRY dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.3.3:bd03/01/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn09JHRY:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9350 dmi.sys.vendor: Dell Inc. upstart.unity-panel-service.log: (unity-panel-service:1483): Indicator-Appmenu-WARNING **: Already have a menu for window ID 71303388 with path /com/canonical/menu/44000DC from :1.72, unregistering that one version.compiz: compiz 1:0.9.12.2+16.04.20160331-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.18.1-1ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu3 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2 xserver.bootTime: Tue Apr 5 18:03:49 2016 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 5194 vendor SHP xserver.version: 2:1.18.1-1ubuntu4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566410/+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