Comment 33 for bug 371279

(In reply to comment #13)
> (In reply to comment #11)
> > (In reply to comment #10)
> > > With these extra coordinate checks the crash no longer occours here.
> >
> > So far, so good. Can you set a gdb breakpoint on the RADEONUploadToScreenCP()
> > line that returns FALSE after these new checks, and attach a backtrace from
> > when it triggers?
> >
>
> I succeeded in attaching gdb to the Xorg process and setting the required
> breakpoint. I did this from a VT. Then I told gdb to continue execution (with c
> command), but when switching back to Xorg all I get is a black screen (had to
> reboot).
>

I'll have a look at this:
http://www.x.org/wiki/Development/Documentation/ServerDebugging
...