A further comment: I noticed this bug report here which seems to report a similar issue https://bugs.launchpad.net/compiz/+bug/1293384
I also figured out that even moving the mouse around causes high CPU usage. For example, launch Nautilus and move the mouse around inside it for 15-20 seconds or so. My CPU usage jumps to 25% for Xorg, 25% for nautilus, and 15% for compiz. Same thing happens with other programs like Firefox. So I searched around some more and found this bug report: https://bugs.launchpad.net/xorg-server/+bug/1250277 It seems that there's a chance all of these bug reports might be related. I will test on my office PC soon, which has an nvidia card, and report back. -- You received this bug notification because you are a member of Desktop 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1337749/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
