If I enable/define DEBUG for the build, I can see that the error from X is 
"BadAccess":
$ compiz --replace
Checking for Xgl: not present.
Detected PCI ID for VGA: 05:00.0 0300: 10de:0140 (rev a2) (prog-if 00 [VGA])
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Comparing resolution (1920x1200) to maximum 3D texture size (4096): Passed.
Checking for nVidia: present.
Checking for FBConfig: present.
Checking for Xgl: not present.
Starting kde-window-decorator
X Error of failed request: BadAccess (attempt to access private resource denied)
  Major opcode of failed request:  2 (X_ChangeWindowAttributes)
  Minor opcode of failed request:  0
  Resource id in failed request:  0x1a5
/usr/bin/compiz.real (core) - Error: Another window manager is already running 
on screen: 0
/usr/bin/compiz.real (core) - Fatal: No manageable screens found on display :0.0

-- 
compiz stopped working with KDE ("Error: Another window manager is already 
running")
https://bugs.launchpad.net/bugs/159409
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