Created attachment 89601 [details] 3.11 screenshot Hardware: AMD HD 5770 Motherboard: MSI 790FX-GD70 Upon updating to 3.12 Linux kernel noticed that render-to-texture (FBO) in Warsow has regressed. In 3.12 the target texture seems to contain random but consistent region of video card's texture memory: the blueish pattern on the screenshot definitely looks like a normalmap. We could not reproduce the bug on another machine with AMD HD 67xx.
Created attachment 89602 [details] 3.12 screenshot
Did you only update your kernel or did you also update mesa?
No I didn't. Do you recommend updating to 9.3/development version of Mesa to see if the bug can not be reproduced there?
If you only changed the kernel, can you bisect?
Created attachment 89622 [details] 3.12 + Mesa-dev (Intel) screenshot Same spot on Intel Ivybridge Mobile (HD 4000). Looks identical both in Mesa 9.3 and Mesa 10-dev.
Ok, I will update to Mesa 10-dev when I get back home and if it doesn't help, I'll try to bisect.
Ok, after mucho fruitless bisecting all I was able to figure out is that the bug is reproducable on stock 3.11+ kernels but _not_ on 3.11 kernel shipped with Ubuntu 13.10.
Turns out the issue was related to how glGenRenderbuffersEXT generated id numbers for framebuffers. Apparently some kernel change affected the outcome and in combination with bug in the game code caused the reported issue. Resolving as NOTABUG.
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