Switching users in Ubuntu/Ubuntu Gnome freezes graphics
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Low
|
Unassigned |
Bug Description
This bug was present in Ubuntu Gnome 16.04 LTS with GDM, but did a clean install of Ubutnu 16.04 LTS with Unity and LightDM, and the bug is still present.
How to reproduce:
1. Boot the system, wait for LightDM to start and show the Ubuntu Unity greeter.
2. Log in as a user.
3. From the power menu (top right), choose an other user
4. In the password-promt (greeter) for the user, type in the correct password
At this point, one of three thing might happen:
a- The desktop, desktop icons, Unity-launcher and main menu for the user is loaded. The user can use the system as expected!
b- The desktop, desktop icons and Unity-launcher the user is loaded. However, just before the main-menu-bar at the tops loads, the the graphics freezes. I can move the cursor, but that's it. It is not possible to click or do anything with the mouse-cursor.
c- Same as (b), but during this process the screen goes complete blank (black), with only the cursor showing (and moving).
When (b) or (c), pressing ALT+F1-F6 does not help, the screen just stays the same (except the cursor dispersers). Pressing ALT+F7 afterwards does not bring the cursor back.
The system has not frozen. I can SSH to the box and it lives as nothing has happened. It's only effecting the display/graphics.
This bug happens about 1/3 of the times I switch the user. Sometimes I can switch to and from users several times (2-5) before this bug comes to life.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-
ProcVersionSign
Uname: Linux 4.4.0-57-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
Date: Mon Dec 26 16:58:42 2016
HibernationDevice: RESUME=
InstallationDate: Installed on 2016-12-18 (8 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
IwConfig:
lo no wireless extensions.
eno1 no wireless extensions.
Lsusb:
Bus 002 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
PulseList:
Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
No PulseAudio daemon running, or not running as session daemon.
RelatedPackageV
linux-
linux-
linux-firmware 1.157.6
RfKill:
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/21/2016
dmi.bios.vendor: Intel Corp.
dmi.bios.version: GKPPT10H.
dmi.board.name: DCP847SKE
dmi.board.vendor: Intel Corporation
dmi.board.version: G80890-105
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCor
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