https://bugs.freedesktop.org/show_bug.cgi?id=56918
--- Comment #3 from Tom Stellard tstellar@gmail.com --- (In reply to comment #2)
How do I set that? In the GRUB kernel boot options? Or with "setenv"? And where do I look for the debugging output? dmesg? Xorg.log? Or somewhere else?
Open a terminal a start firefox like this:
RADEON_DEBUG=fp,vp firefox &>mapsgl.log
Then do some stuff with MapsGL, close firefox and post the mapsgl.log file.