Not linking (not sure if it is identical or not) but this bug in Debian on 
Intel shares similar timeout messages only with lower stop values.
"[    40.470] (EE) R128(0): Idle timed out, resetting engine...
[    40.470] (EE) R128(0): R128CCEWaitForIdle: CCE stop -9"
One submitter there resolved with installing linux-firmware-non-free.  This 
does not solve on my two machines tested.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=653029

Also found this VERY old bug with the same timeout messages that may be 
relevant. It indicates:
"Found in versions 4.3.0-2, 4.3.0-7
Fixed in version xfree86/4.3.0.dfsg.1-5"
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=236187

May be the timeout and AGP 0x are two separate issues?

Also, in case it helps, found new symptom speculate relates to AGP 
0x/ForcePCIMode=True
supertux-stable in GL mode works fine but background changes to all white 
instead of graphics. Doesn't do this with software rendering and 
ForcePCIMode=False

** Bug watch added: Debian Bug tracker #653029
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=653029

** Bug watch added: Debian Bug tracker #236187
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=236187

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which is subscribed to xserver-xorg-video-r128 in Ubuntu.
https://bugs.launchpad.net/bugs/1023975

Title:
  PPC R128 - AGP V2 device into 0x mode - Xorg Freeze

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