[Bug 1768766] Re: Display monitor randomly switch to “economy mode” during boot sequence and/or login sequence

[Joseph Maillardet]

Sorry, I forgot to give my workaround :
* Turn off the monitor (electrically), disconnect the power cord if need...
* Turn back on the monitor.
* There you go.

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https://bugs.launchpad.net/bugs/1768766

Title:
  Display monitor randomly switch to “economy mode” during boot sequence
  and/or login sequence

Status in libdrm package in Ubuntu:
  New

Bug description:
  When my laptop start on a dock with lid closed and with 2 monitors
  connected, one DVI and one DisplayPort, sometime, one of the monitors
  switch to “economy mode” and turn off, randomly.

  * Sometime, it's happen during boot sequence, when text flow is displayed (yes, I remove “quiet splash” in /etc/default/grub).
  * Sometime, it's happen on login screen. When it's the bad one, I can't see the login form.
  * Sometime, it's happen after login, when the desktop is loading.
  * And some other time, on lucky day, it's not happen at all !

  Please, give me instruction to found where the problem come from ?
  It's really annoying.

  Thanks for attentions.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libdrm-amdgpu1 2.4.91-2
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Thu May  3 10:06:08 2018
  Dependencies:
   gcc-8-base 8-20180414-1ubuntu2
   libc6 2.27-3ubuntu1
   libdrm-common 2.4.91-2
   libdrm2 2.4.91-2
   libgcc1 1:8-20180414-1ubuntu2
  DistUpgraded: 2018-04-24 09:45:14,351 DEBUG /openCache(), new cache size 90810
  DistroCodename: bionic
  DistroVariant: ubuntu
  DkmsStatus:
   openrazer-driver, 1.0.0, 4.15.0-19-generic, x86_64: installed
   openrazer-driver, 1.0.0, 4.15.0-20-generic, x86_64: installed
  EcryptfsInUse: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Venus XT [Radeon HD 8870M / R9 M270X/M370X] [1002:6821] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Venus XT [Radeon HD 8870M / R9 M270X/M370X] [103c:2254]
  MachineType: Hewlett-Packard HP ZBook 15 G2
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic root=UUID=79ab29f5-d9eb-4aff-bfb8-8639c60401cb ro
  SourcePackage: libdrm
  UpgradeStatus: Upgraded to bionic on 2018-04-24 (9 days ago)
  dmi.bios.date: 04/25/2016
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M70 Ver. 01.15
  dmi.board.name: 2253
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 03.12
  dmi.chassis.asset.tag: CND54722DC
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrM70Ver.01.15:bd04/25/2016:svnHewlett-Packard:pnHPZBook15G2:pvrA3009CD10002:rvnHewlett-Packard:rn2253:rvrKBCVersion03.12:cvnHewlett-Packard:ct10:cvr:
  dmi.product.family: 103C_5336AN G=N
  dmi.product.name: HP ZBook 15 G2
  dmi.product.version: A3009CD10002
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  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

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