screen flickers when switching virtual desktops in Unity

Bug #955487 reported by Sven Romeike on 2012-03-14
This bug affects 2 people
Affects Status Importance Assigned to Milestone
unity (Ubuntu)

Bug Description

When I have multiple applications opened on several virtual Desktops and switch virtual Desktops either with the Super+S Keybinding or the Icon on the Launcher the screen flickers when it is redrawn after I selected another Desktop. From a User point of view this must have something to do with the drawing of the glowing orange border around the selected desktop.


1) set your desktop background to something dark (may be optional)
2) start multiple applications on different virtual desktops
3) either press Super+S or use the Switcher Icon at the Launcher and select different virtual desktops multiple times

the result should sometimes be a flickering when the windows are drawn again. The effect of this is stronger when the desktop background is black.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.6.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Ist ein Verzeichnis: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.20 Mon Feb 6 21:07:30 PST 2012
 GCC version: gcc-Version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu3)

ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,place,regex,gnomecompat,imgpng,mousepoll,vpswitch,move,resize,grid,snap,animation,wall,fade,scale,session,unitymtgrabhandles,expo,workarounds,ezoom,unityshell]
CompositorRunning: compiz
 [ 30.032005] eth0: no IPv6 routers present
 [ 5901.528918] empathy-chat[3434] general protection ip:7f1779e81b9d sp:7fff36c322b0 error:0 in[7f1779e59000+56000]
 [ 5925.263636] process `skype' is using obsolete setsockopt SO_BSDCOMPAT
Date: Wed Mar 14 22:00:30 2012
DistUpgraded: Log time: 2012-03-14 14:21:01.971859
DistroCodename: precise
DistroVariant: ubuntu
 nvidia-current-updates, 295.20, 3.0.0-16-generic, x86_64: installed
 nvidia-current-updates, 295.20, 3.2.0-18-generic, x86_64: installed
GraphicsCard: NVIDIA Corporation G92 [GeForce 9800 GTX] [10de:0612] (rev a2) (prog-if 00 [VGA controller])
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
 xorg:nvidia_current - Beschleunigter Grafiktreiber von NVIDIA (Proprietär, Deaktiviert, Nicht benutzt)
 xorg:nvidia_current_updates - NVIDIAs beschleunigte Grafiktreiber (Nachträgliche Aktualisierungen) (Proprietär, Aktiviert, In Benutzung)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic root=UUID=56d23492-5b0c-4d10-9428-c7f00aa1231f ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-03-14 (0 days ago) 11/06/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.4
dmi.board.asset.tag: To Be Filled By O.E.M. MS-7395
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.4:bd11/06/2008:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7395:pvr1.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rnMS-7395:rvr1.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr1.0: MS-7395
dmi.product.version: 1.0
version.compiz: compiz 1:
version.ia32-libs: ia32-libs 20090808ubuntu34
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu4
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

Sven Romeike (lun4tic) wrote :
Daniel van Vugt (vanvugt) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 862430, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in unity (Ubuntu):
status: New → Confirmed
To post a comment you must log in.