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[Furkan Alaca <falaca@xxxxxxxxx>]

Abhijit, you're right scrolling in Chrome "only" uses around 40% or so.
I noticed it doesn't have smooth scrolling enabled. After disabling
smooth scrolling in Firefox (general.smoothScroll in about:config), CPU
usage dropped to about the same level as Chrome. Still extremely high
for just scrolling down a page, though.

I tested on the office computer today, which is a Core i7-920 w/ 6GB of
RAM and an Nvidia GT 9400 with the proprietary driver installed. I can
confirm that it suffers from the same problem (also running Ubuntu
14.04).

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Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1337749

Title:
  High CPU usage after resizing a window

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  Background:

  Symptoms are 50-120% CPU usage when scrolling (especially Firefox),
  dragging around a window, resizing windows, basically any 2D graphics
  rendering on the desktop. This happens both in fglrx and the open
  source radeon driver. I started my debugging process by changing
  various settings, restarting, running "top" in a terminal, launching a
  Nautilus window, and quickly dragging it around with the mouse in
  circles while watching the CPU usage rise to around 50%. Resizing the
  window makes it jump to 100%+. Xorg and compiz are the culprits, with
  the CPU usage being split around 50/50 between them.

  Reproducing the issue:

  After a lot of searching I found some tips in the Arch Wiki article
  for the open source radeon driver, and I put together the following
  xorg.conf:

  Section "Module"
  	Load "dri2"
  	Load "glamoregl" 
  EndSection

  Section "Device"
      Identifier "Radeon 6670"
      Driver "radeon"
      Option  "MigrationHeuristic"  "greedy"
       Option "AccelMethod"           "glamor"
  EndSection

  After applying these settings, launching Nautilus and dragging it
  around only resulted in about 4% CPU usage each for xorg and compiz.
  Then, resizing the window (click and hold a side, and just keep moving
  the mouse left and right) made Xorg jump to 70% and compiz 50%. After
  that, when I start dragging the window around, CPU usage is back to
  around what it was originally: About 25% for compiz and 15% for Xorg.
  This exact behaviour happens after each reboot: The CPU usage is
  initially low when dragging the window around, but resizing it somehow
  messes things up and it never goes back to normal after that.

  I'm using a Radeon 6670 right now. I'll be receiving an R7 260X in
  about a week or so, so I won't be able to test with the exact same
  hardware, but I'm expecting at least similar behaviour since I also
  swapped in an R7 250 and was having the same issues.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.2
  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
  Date: Fri Jul  4 03:52:17 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.13.0-29-generic, x86_64: installed
   virtualbox, 4.3.10, 3.13.0-30-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Turks XT [Radeon HD 6670/7670] [1002:6758] (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:2545]
  InstallationDate: Installed on 2014-06-06 (27 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Gigabyte Technology Co., Ltd. GA-970A-D3
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic root=UUID=d254b01f-2bf2-4b57-acdc-c796786f4c4c ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/03/2013
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F12
  dmi.board.name: GA-970A-D3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd09/03/2013:svnGigabyteTechnologyCo.,Ltd.:pnGA-970A-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-970A-D3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-970A-D3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Fri Jul  4 03:38:17 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2
  xserver.video_driver: radeon

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