Public bug reported:
The scenario is this:
* Multiple windows of the same application are opened
* Some of them are fullscreen
* The user clicks the application icon in the side tray, starting the window
switcher for it (so that the user can select a certain window)
This last step actually triggers a *resize* for the fullscreened windows
(for no reason at all): the windows get shrunk vertically a little bit,
and regain their fullscreen size when the user makes a decision.
This might look like a side issue, but it's not: a fullscreen Firefox
(or any other browser) will relayout the current webpage because of that
size change; complex GUI applications like Blender will start their
complicated heuristics to optimize their UI controls; and so on.
For these applications, there's a huge spike in CPU when triggering the
window switcher (CPU used by the applications! Not by Unity or Compiz),
while such switching should be totally transparent to the applications.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160906-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59
Uname: Linux 4.4.0-75-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Wed May 3 00:53:41 2017
DistUpgraded: 2016-09-29 11:49:27,678 WARNING no activity on terminal for 300
seconds (Applicazione delle modifiche)
DistroCodename: xenial
DistroVariant: ubuntu
GraphicsCard:
Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09)
(prog-if 00 [VGA controller])
Subsystem: Lenovo Broadwell-U Integrated Graphics [17aa:2225]
InstallationDate: Installed on 2015-10-15 (565 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: LENOVO 20E2000PUK
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-75-generic.efi.signed
root=UUID=daffac49-1ba4-415c-9de1-a1d41e8e4c0f ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to xenial on 2016-09-29 (215 days ago)
dmi.bios.date: 08/20/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N11ET34W (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20E2000PUK
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN11ET34W(1.10):bd08/20/2015:svnLENOVO:pn20E2000PUK:pvrThinkPadW550s:rvnLENOVO:rn20E2000PUK:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20E2000PUK
dmi.product.version: ThinkPad W550s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.70-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.6-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.6-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Tue May 2 01:18:35 2017
xserver.configfile: default
xserver.errors: open /dev/dri/card0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 38562
vendor MEI
xserver.version: 2:1.18.4-0ubuntu0.2
** Affects: unity (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial
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https://bugs.launchpad.net/bugs/1687812
Title:
Same-application window switcher resizes the application windows
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