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[Bug 1067349] Re: Unity is sluggish and uses a lot of CPU (even with hardware support) on low-end systems

To: dx-packages@xxxxxxxxxxxxxxxxxxx
From: "Stephen M. Webb" <stephen.webb@xxxxxxxxxxxxx>
Date: Thu, 19 Mar 2015 15:38:12 -0000
Reply-to: Bug 1067349 <1067349@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: unity
    Milestone: 7.3.2 => 7.3.3

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https://bugs.launchpad.net/bugs/1067349

Title:
  Unity is sluggish and uses a lot of CPU (even with hardware support)
  on low-end systems

Status in Unity:
  Confirmed
Status in unity package in Ubuntu:
  Confirmed

Bug description:
  I asked this question already on Askubuntu, but was directed to file a
  bug: I have a nice Lenovo Thinkpad Edge 11 AMD Neo II with a ATI
  Radeon 4225 integrated graphics device. In my perception this is
  already a not-so-lowspeced device, but still a netbook.

  Up to Ubuntu 12.04 precise pangolin I preferred Unity2D over Unity
  mainly because it did perform much better than Unity and moreover I
  was able to achieve 5-6h with one battery charge. The typical load of
  an idling desktop settled around 0.00 to 0.02.

  Yesterday I tried the new Beta 2 of Ubuntu Quantal Quetzal: This does
  no longer offer a Unity2D version. The performance itself has
  definitely improved over Unity in precise, but nevertheless I do
  experience now a minimum load of 0.24 to 0.36 while completely idling.
  According to top this is mainly due to compiz eating about 3-6% CPU
  all the time.

  In comparison to my Unity2D experience, quantal is more sluggish, eats
  much faster my battery and produces significant more fan noise. I
  already tried a few tweaks like static blurring, fast texture renderer
  or choosing alternate window manager on precise, but without a
  significant change.

  Are there ways which enable me to continue to use Ubuntu/Unity on my device without major loss of functionality, performance and battery life?
  --- 
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: i386
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,workarounds,scale,expo,ezoom]
  DistroRelease: Ubuntu 12.10
  MarkForUpload: True
  Package: unity 6.8.0-0ubuntu2
  PackageArchitecture: i386
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  Tags:  quantal running-unity
  Uname: Linux 3.5.0-18-generic i686
  UpgradeStatus: Upgraded to quantal on 2012-11-06 (0 days ago)
  UserGroups: adm admin audio cdrom floppy fuse kvm lpadmin netdev plugdev tape video

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