(In reply to comment #84) > Yes, that is characteristic of this bug. The internal vertex/texture > coordinates that are being passed along the GPU pipeline become corrupt (it > looks like we overflow a small ring buffer). The only effective approach
If it would be plain 'overflow' - than I'd be seeing this kind of corruption always right after X starts. But it seems like i.e. Firefox must be used for certain period of time, to make these corruptions visible. Surely I'm not not an expert on GPU programming - but maybe when the physical memory gets fragmented enough after some usage there are some 'cached bo' objects - maybe their usage is not fully synchronized? Also the effect could also disappear (I've not yet noticed any particular way for that) - so then Firefox scroll even the very same pages and there is no problem (i.e. now I run still the same session - and I do not get any visible problem) > I've found so far has been to keep the number of rectangles inside the GPU > pipeline below a magic value - but that is quite tricky here, and the Well why the number would sometimes work for ours without a single visible problem, and suddenly start to show them again? My impression here is, when this problem is visible, it looks like operations is working with 'wrong' parameters (i.e. sometimes I see the image stretched, inverted, zoomed) Maybe parameters have only some bits mangled - not fully synchronized memory from CPU for GPU?? -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1098334 Title: [gen4 sna] Font corruption in Chromium tab bar To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1098334/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
