https://bugs.freedesktop.org/show_bug.cgi?id=101325
--- Comment #7 from Julien Isorce julien.isorce@gmail.com --- Hi Luke, any chance you can try the apitrace https://bugs.freedesktop.org/show_bug.cgi?id=100712#c7 ? What worked for me on that bug was to disable write-combining by setting the env var R600_DEBUG=nowc for both Xorg and for the gl application. It affects performance a lot on some situations but this gives some hints were to look at for debugging.