(In reply to comment #136) > The issue that the VUE (which is a memory slot used by the GPU for a vertex > entry) are reused by a second thread before the first thread is complete, > causing the first thread to generate invalid texture coordinates and corrupt > rendering. That is a hardware read-write hazard bug (or at least I have not > found any controls in the EU state to prevent it).
I don't think it's that easy to explain - The typical problem in my case is - when I freshly start the Xsession - I do not observe any rendering bug. I need to use this machine for a while, to start to get those errors. So if there would be some 'easy to trigger hardware race' - it should be reproducible all the time. But in my case it seem - the probability increases over the time heavily - maybe with the amount of cached BO segments ? Or maybe it depends on how the memory order is set - i.e. the problem is triggered when certain memory read pattern start to appear ? Since once the issue of flicker starts - it then happens all the time - and then suddenly it disappears for a while again ? So maybe there needs to be prohibited some memory offset/alignment of buffers with vertices ? -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1098489 Title: [gen4] Corruption in Chrome omni bar results using Intel SNA Status in X.org xf86-video-intel: In Progress Status in “xserver-xorg-video-intel” package in Ubuntu: Incomplete Bug description: After enabling Intel SNA the favicons in the omnibar search results are corrupted. I've attached a screenshot of the issue with the bug report, note the favicon of the first result is corrupted. This bug is probably the same as bug #1098334, more information may be seen there. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: xorg 1:7.7+1ubuntu4 ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0 Uname: Linux 3.7.0-7-generic x86_64 ApportVersion: 2.8-0ubuntu1 Architecture: amd64 Date: Fri Jan 11 15:31:21 2013 EcryptfsInUse: Yes InstallationDate: Installed on 2012-12-03 (38 days ago) InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64+mac (20121203) MarkForUpload: True SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) --- ApportVersion: 2.8-0ubuntu1 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None DistUpgraded: Fresh install DistroCodename: raring DistroRelease: Ubuntu 13.04 DistroVariant: kubuntu EcryptfsInUse: Yes ExtraDebuggingInterest: No GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Apple Inc. Device [106b:00dc] InstallationDate: Installed on 2012-12-03 (38 days ago) InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64+mac (20121203) MachineType: Apple Inc. MacBookPro8,2 MarkForUpload: True Package: xserver-xorg-video-intel 2:2.20.17-0ubuntu1 PackageArchitecture: amd64 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.7.0-7-generic root=/dev/mapper/kubuntu-root ro quiet splash i915.lvds_channel_mode=2 i915.modeset=1 i915.lvds_use_ssc=0 vt.handoff=7 ProcVersionSignature: Ubuntu 3.7.0-7.15-generic 3.7.0 Tags: raring kubuntu single-occurrence Uname: Linux 3.7.0-7-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo XorgConf: Section "Device" Identifier "Card0" Driver "intel" Option "AccelMethod" "sna" EndSection dmi.bios.date: 01/24/12 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP81.88Z.0047.B27.1201241646 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-94245A3940C91C80 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro8,2 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-94245A3940C91C80 dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80: dmi.product.name: MacBookPro8,2 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.40-1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.1-0ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.1-0ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.13.1.901-0ubuntu1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.0.0-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.17-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu1 xserver.bootTime: Fri Jan 11 16:00:31 2013 xserver.configfile: /etc/X11/xorg.conf xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.13.1.901-0ubuntu1 xserver.video_driver: intel To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1098489/+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
