Comment # 6
on bug 79850
from Michel Dänzer
First of all, if you are using a compositing manager, make sure it unredirects fullscreen windows. Also make sure vblank_mode isn't set to 0 in ~/.drirc or /etc/drirc or as an environment variable. With that ruled out, we'll need to work backwards why the driver can't use page flipping. The final decision on that happens in the X driver's can_flip function in radeon_dri2.c. From a remote shell, attach gdb to the X server process and set a breakpoint on that function. If it gets called, check which of its conditions are not met.
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