Strange flashing application switcher

[Jonas Schwabe]

I will attach a video that shows the issue.
The app switcher (ALT+Tab / ALT+^) flashes while I don't switch between windows (it seems to be a dark shadow that is getting darker, goes away and reappears right away).
I found out that this only happens when I have Chromium OR Spotify open (and not minimized, they don't need to be in front however). There might be other apps which are causing the same issue.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity 6.6.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4
Uname: Linux 3.5.0-16-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.6.1-0ubuntu1
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Thu Oct 4 18:04:24 2012
DistUpgraded: Fresh install
DistroCodename: quantal
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:04cc]
 Advanced Micro Devices [AMD] nee ATI Caicos [Radeon HD 6400M/7400M Series] [1002:6760] (rev ff) (prog-if ff)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64+mac (20120922)
MachineType: Dell Inc. Vostro 3350
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-16-generic root=/dev/mapper/ubuntu-root ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/30/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0M516T
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd09/30/2011:svnDellInc.:pnVostro3350:pvrNotSpecified:rvnDellInc.:rn0M516T:rvrA07:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Vostro 3350
dmi.product.version: Not Specified
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.8.4-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0~git20120917.7cfd42ce-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0~git20120917.7cfd42ce-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu5
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu2

[Launchpad Janitor (janitor)]

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

[Edward Donovan (edward.donovan)]

I see that flickering, of the border of the alt-tab switcher, too. I can't reproduce it on demand. I don't use either of the particular apps you mention. I'll try to keep an eye out for what apps might be open, when it happens to me next.

[Marco Trevisan (Treviño) (3v1n0)]

Is this fixed for you in Raring?

[Jonas Schwabe (jonas-schwabe)]

For me it does not even happen in a clean installation of 12.10 (not after an update), I did a lot of testing with my display drivers, which might have lead to this issue. It has been a bad setup thought.
Maybe Edward can still reproduce it? Else it should be marked as invalid.

[Edward Donovan (edward.donovan)]

I still see it on my up-to-date Raring box. Not all the time, so I still can't reproduce it at will. Have certainly seen in the last few days since you asked. :)

This box has Intel graphics, Ivy Bridge HD. (Currently using SNA. I've seen this under both UXA and SNA.)

I guess I should re-open the bug. Thanks.

[Matthew Tucker-Simmons (tucker-simmons)]

Another data point, this happens to me in a clean install of Quantal.

[Brandon Schaefer (brandontschaefer)]

I've not been able to reproduce this :(.

[Matthew Tucker-Simmons (tucker-simmons)]

This is still happening to me in Raring.

[Edward Donovan (edward.donovan)]

Hi all, sorry it took me a long time to respond. This is still occurring, on and off, in my Raring install (which is an upgrade not a fresh installation). Just as in the video attached above. Same machine with Intel graphics.

On a Raring machine with a Radeon card, I've never seen it. I have a lot less time to test that one, so, small sample size.

I'll be happy to report more if I can.

Thanks.

[Andrea Azzarone (azzar1)]

Can you still see this issue? It happened to me before, but seems to work fine now.

[Jonas Schwabe (jonas-schwabe)]

You are right I didn't see it in the last few releases. So I presume it has been fixed somehow. I guess we can mark this as being fixed.