(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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1098334 Title: [gen4 sna] Font corruption To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1098334/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
