(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/1098334 Title: [gen4 sna] Font corruption Status in X.org xf86-video-intel: In Progress Status in “xserver-xorg-video-intel” package in Ubuntu: Triaged Bug description: After enabling the SNA acceleration method and rebooting, I noticed that graphical glitches appeared in the letters on Chromium's tab bar during the mouse hover animation. I've attached a screenshot illustrating this, particularly with the letter "g" in the screenshot. 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: Thu Jan 10 16:00:55 2013 InstallationDate: Installed on 2012-09-24 (107 days ago) InstallationMedia: Kubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120822.2) MarkForUpload: True SourcePackage: xorg UpgradeStatus: Upgraded to raring on 2012-09-25 (107 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1098334/+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
