(In reply to comment #19) > e943e5c291c5f4c017f9f5a483f1940313333fc3 is the first bad commit > commit e943e5c291c5f4c017f9f5a483f1940313333fc3 > Author: Chad Versace <chad.vers...@linux.intel.com> > Date: Thu Aug 2 17:13:17 2012 -0700 > > intel: Advertise multisample DRI2 configs on gen >= 6 > > This turns on window system MSAA. > > So in other words, it looks like KDE is using multisampling now, whereas it > didn't before. Our implementation of that may not be optimal, and may have > bugs, but it will always be far slower than single sampling. > > My next question would be: how can one disable the use of MSAA in KWin or > Plasma? I don't see an option for that, but I would be really surprised if > there wasn't one...
The algorithm that chooses the FBConfig doesn't check the values of GLX_SAMPLES and GLX_SAMPLE_BUFFERS, so I guess it ends up picking an MSAA config purely by accident. That's something we'll have to fix in KWin. But unfortunately that also means that there is no way to enable or disable the use of MSAA right now. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1061073 Title: Desktop effects are slow and desktop corruption using mesa 9 Status in KDE Base Workspace: New Status in Mesa: Won't Fix Status in “kde-workspace” package in Ubuntu: Confirmed Status in “mesa” package in Ubuntu: Confirmed Bug description: I have Kubuntu 12.10 set up on a ThinkPad T430. I'm experiencing both desktop corruption and slow performance of desktop effects. I've tried to downgrade mesa to 8.0.4 and that fixed the problem. Attached is a video comparing the two. The video does not show the desktop corruption I mention (vertical lines appearing) but I will attach a screenshot of that. I originally thought this was related to bug 1042211 but they told me to file another report since it seems to be different artifacts that I'm seeing. Of course I can't say for sure whether the slow performance and the artifacts are due to the same problem but the artifacts seem to appear when the desktop effects are activated. As you can see in the video, mesa 9.0 displays much "jerkier" effects and it seems that when the artifacts come this jerking becomes really bad just before the artifacts appear. Just now I did notice that the artifacts appeared at the mouse pointer when I clicked in a window. The artifacts followed the mouse pointer as I moved it but after clicking a few times they disappeared. WORKAROUND: As described in bug 1042211 I downloaded the 8.0.4 version of mesa from https://launchpad.net/ubuntu/+source/mesa/8.0.4-1ubuntu1. This fixed the problem for me. Since it took a little while for me to figure out how to get the .deb packages from that page, here is how for anyone who wants to try: 1) Go to the above page. 2) Under "Builds" select your architecture 3) This will bring you to a page with all the .deb files for your architecture. I only installed the libgl1-mesa-dri, libgl1-mesa-glx, libglapi-mesa and libglu1-mesa packages. Please let me know if you need more information. p.s. I had some problems choosing the package for this bug. It wouldn't let me put it on libgl1-mesa so I put it on libgl1-mesa-dri. ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: xorg 1:7.7+1ubuntu4 ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4 Uname: Linux 3.5.0-16-generic x86_64 ApportVersion: 2.6.1-0ubuntu1 Architecture: amd64 Date: Wed Oct 3 15:40:20 2012 InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120905) ProcEnviron: LANGUAGE= TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) --- ApportVersion: 2.6.1-0ubuntu1 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: kwin DistUpgraded: Fresh install DistroCodename: quantal DistroRelease: Ubuntu 12.10 DistroVariant: kubuntu DkmsStatus: virtualbox, 4.1.18, 3.5.0-16-generic, x86_64: installed ExtraDebuggingInterest: I just need to know a workaround GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:21f3] InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120905) MachineType: LENOVO 2347W2U Package: mesa (not installed) ProcEnviron: LANGUAGE= TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-16-generic root=UUID=c8916e6c-a99f-43f1-9d8c-c1daf21fedac ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.5.0-16.25-generic 3.5.4 Tags: quantal kubuntu Uname: Linux 3.5.0-16-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 05/25/2012 dmi.bios.vendor: LENOVO dmi.bios.version: G1ET41WW (1.16 ) dmi.board.asset.tag: Not Available dmi.board.name: 2347W2U dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG1ET41WW(1.16):bd05/25/2012:svnLENOVO:pn2347W2U:pvrThinkPadT430:rvnLENOVO:rn2347W2U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 2347W2U dmi.product.version: ThinkPad T430 dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.39-0ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.0~git20120917.7cfd42ce-0ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.0~git20120917.7cfd42ce-0ubuntu3 version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu5 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/kdebase-workspace/+bug/1061073/+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
