I have tried the solution from comment #6 and it works. It would be helpful to understand why this works. Digging through the comments it looks like mesa uses not the GPU acceleration when the variable is not set. This looks like a design error in mesa. Maybe mesa developers should be asked about this. However, I have tried gnome-shell (before adding the environment setting) and it worked like a charm indicating that gnome-shell sets this variable on its own or initializes mesa differently. Considering gnome-shell was freaking slow compared to unity in 13.04. there must have been a not so wise change in unity.
-- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1222602 Title: [gen3] Bad performance on GMA950 and GMA3150 Status in Mesa: Confirmed Status in “mesa” package in Ubuntu: Confirmed Status in “unity” package in Ubuntu: Confirmed Bug description: After the upgrade to Mesa 9.2.0 unity is barely usable. Dash, Alt+Tab switcher and Alt+F2 command line shows in more than 1 minute, using 100% cpu. A downgrade to mesa 9.1.6-2ubuntu2 restores full performance. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: libgl1-mesa-glx 9.2-1ubuntu1 ProcVersionSignature: Ubuntu 3.11.0-5.11-generic 3.11.0 Uname: Linux 3.11.0-5-generic i686 .tmp.unity.support.test.0: ApportVersion: 2.12.1-0ubuntu3 Architecture: i386 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Mon Sep 9 01:51:45 2013 DistUpgraded: 2013-09-08 20:36:47,811 DEBUG enabling apt cron job DistroCodename: saucy DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation Mobile 945GSE Express Integrated Graphics Controller [8086:27ae] (rev 03) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. Device [1462:0110] Subsystem: Micro-Star International Co., Ltd. Device [1462:0110] InstallationDate: Installed on 2013-09-07 (1 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424) MachineType: MICRO-STAR INTERNATIONAL CO., LTD U90/U100 MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=it_IT.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-5-generic root=UUID=674329c8-d0a6-4954-89c0-72821cfa0ba8 ro quiet splash vt.handoff=7 SourcePackage: mesa UpgradeStatus: Upgraded to saucy on 2013-09-08 (0 days ago) dmi.bios.date: 12/01/2009 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 4.6.3 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: U90/U100 dmi.board.vendor: MICRO-STAR INTERNATIONAL CO., LTD dmi.board.version: Ver.001 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 10 dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO., LTD dmi.chassis.version: Ver.001 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.3:bd12/01/2009:svnMICRO-STARINTERNATIONALCO.,LTD:pnU90/U100:pvrVer.001:rvnMICRO-STARINTERNATIONALCO.,LTD:rnU90/U100:rvrVer.001:cvnMICRO-STARINTERNATIONALCO.,LTD:ct10:cvrVer.001: dmi.product.name: U90/U100 dmi.product.version: Ver.001 dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO., LTD version.compiz: compiz 1:0.9.10+13.10.20130828.2-0ubuntu1 version.libdrm2: libdrm2 2.4.46-1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.2-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.2-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.14.2.901-2ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu6 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.14-4ubuntu3 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1 xserver.bootTime: Mon Sep 9 01:46:55 2013 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 1001 vendor HSD xserver.version: 2:1.14.2.901-2ubuntu4 To manage notifications about this bug go to: https://bugs.launchpad.net/mesa/+bug/1222602/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp
