Comment # 19 on bug 79850 from Sylvain BERTRAND

news:

I did dive reluctantly into rpm dev (with debug info).

I got my self a xorg server compiled properly for debugging with gdb and its
related debufinfo.

Only dri2.c:934 make DRI2CanFlip return FALSE. I check my xorg server log and I
got:
[    13.506] (**) RADEON(0): Option "BackingStore" "off"
[    13.506] (**) RADEON(0): Backing store disabled