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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1791913
Title:
HP EliteBook 840 G5 only able to initialise displays on first docking
Status in linux package in Ubuntu:
Confirmed
Bug description:
I'm running a HP EliteBook 840 G5 and HP UlstraSlim Docking Station
with two external DisplayPort displays (both 1080p). Upon docking the
machine for the first time the two external displays come up as
expected. Upon removal the internal display continues to work as
expected, but the external displays never come up.
Dock verified good and working with another machine.
Upon disconnect the following is emitted to the journal:
Sep 11 10:13:01 hlc002155 kernel: [drm:intel_dp_start_link_train [i915]]
*ERROR* failed to enable link training
Sep 11 10:13:02 hlc002155 kernel: [drm:intel_mst_pre_enable_dp [i915]]
*ERROR* failed to allocate vcpi
Upon reconnect the following:
Sep 11 10:13:15 hlc002155 kernel: [drm:intel_wait_ddi_buf_idle [i915]]
*ERROR* Timeout waiting for DDI BUF C idle bit
I found some issues that seem related:
*
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1552040
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1777863
The workaround described in https://bugs.launchpad.net/ubuntu/+source
/xserver-xorg-video-intel/+bug/1552040/comments/17 didn't seem to work
for me.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-34-generic 4.15.0-34.37
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lukecarrier 2534 F.... pulseaudio
CurrentDesktop: GNOME
Date: Tue Sep 11 10:14:12 2018
HibernationDevice: RESUME=UUID=f10979d4-f0c5-4e4c-b978-a2eee4dd7109
InstallationDate: Installed on 2018-07-18 (54 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 04ca:706e Lite-On Technology Corp.
Bus 001 Device 005: ID 138a:00ab Validity Sensors, Inc.
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP EliteBook 840 G5
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-34-generic
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-34-generic N/A
linux-backports-modules-4.15.0-34-generic N/A
linux-firmware 1.173.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/05/2018
dmi.bios.vendor: HP
dmi.bios.version: Q78 Ver. 01.01.08
dmi.board.name: 83B2
dmi.board.vendor: HP
dmi.board.version: KBC Version 04.50.00
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias:
dmi:bvnHP:bvrQ78Ver.01.01.08:bd06/05/2018:svnHP:pnHPEliteBook840G5:pvr:rvnHP:rn83B2:rvrKBCVersion04.50.00:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP EliteBook
dmi.product.name: HP EliteBook 840 G5
dmi.sys.vendor: HP
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