Public bug reported:
We are experiencing frequent display corruption and flickering when
using Lenovo T450 notebooks with the Lenovo Pro-/Ultra-Docks when
external monitors are connected.
We first experienced these problems when upgrading 16.04 systems to the
HWE stack. The systems are using the integrated Intel graphics card
(i915 kernel module) and the modesetting Xorg driver. The problems are
mostly appearing when the monitors are woken up from standby (e.g. after
coming back from lunch break), or when the system was suspended and is
resumed. But we also have reports from users, that experience those
problems during normal work, but I couldn't verify this myself yet.
Sometimes removing the system from the dock and re-docking it fixes the
problem temporarily, but not always.
I will attach videos which show the problem.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-core-hwe-16.04 2:1.19.6-1ubuntu4.1~16.04.2
ProcVersionSignature: Ubuntu 4.15.0-34.37lvm6-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Apr 11 18:12:00 2019
SourcePackage: xorg-server-hwe-16.04
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xorg-server-hwe-16.04 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug third-party-packages xenial
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https://bugs.launchpad.net/bugs/1824393
Title:
Display corruption with Lenovo T450 and external monitors
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