Public bug reported: Laptop model: Lenovo P51 20HH0011US OS: Fresh install from USB ‘Ubuntu GNOME 16.04.4 LTS’ Monitors: Dell U2415b at 1920x1200, Asus PB278 at 2560x1440
Expected behavior: We install Ubuntu 16.04.4, plug in additional monitors and those monitors work at the native resolution. Actual behavior: This one is going to be hard to describe. But when we plug in a monitor, that monitor will flicker/flash extremely fast. With both HDMI and miniDP outputs. Most of the company has two external monitors and when we plug in a second monitor one or both of the external monitors flickered on 14 of the 15 machines that we tested. We also tested with 20 or so monitors through our process of trying to isolate the problem. I will leave links of the video that we took of the issue. From the online preview you cannot tell what the problem is, but if you download the videos and play them with VLC or something locally, you should be able to see what we are talking about. https://drive.google.com/file/d/1oZQwIf8uaUEytQPQdihIy3eCpVRLe7-T/view?usp=sharing https://drive.google.com/file/d/1eBrfXouqXhddobGHZijM_G4qNIKiLtaI/view?usp=sharing We have noticed that if we change the resolution down to 1920x1080 the issue goes away. The monitors do not flicker on other models of Lenovo’s that we have tried. They also do not flicker with the same computer but running Windows or on any macbook that we have tried. The other weird issue is that once the monitor starts flickering, it stays flickering for about an hour even without a computer plugged into it or if we plug in a different computer that did not make that monitor flicker before it was plugged into a P51 running Ubuntu gnome 16.04.4. Our current workaround is to install Ubuntu MATE 16.04.4 instead of gnome. The monitors work at native resolutions with MATE. Let us know if there is anything else we can do to help with this issue. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.13.0-43.48~16.04.1-generic 4.13.16 Uname: Linux 4.13.0-43-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CurrentDesktop: GNOME Date: Tue May 29 15:24:31 2018 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: NVIDIA Corporation Device [10de:13b6] (rev a2) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:2251] InstallationDate: Installed on 2018-05-29 (0 days ago) InstallationMedia: Ubuntu-GNOME 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228) MachineType: LENOVO 20HH0011US ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-43-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/20/2017 dmi.bios.vendor: LENOVO dmi.bios.version: N1UET41W (1.15 ) dmi.board.asset.tag: Not Available dmi.board.name: 20HH0011US 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.modalias: dmi:bvnLENOVO:bvrN1UET41W(1.15):bd10/20/2017:svnLENOVO:pn20HH0011US:pvrThinkPadP51:rvnLENOVO:rn20HH0011US:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad P51 dmi.product.name: 20HH0011US dmi.product.version: ThinkPad P51 dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.83-1~16.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1 version.xserver-xorg-core: xserver-xorg-core N/A version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug ubuntu xenial -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1774265 Title: Heavy flicker/flashing on external monitors using resolutions higher than 1920x1080 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1774265/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
