Same problem here (Dell Inspiron 1300 with Intel915 video chip) :
everything was running fine with the i810 driver under edgy (including
compiz with cube etc) -- after upgrading to Feisty 7.04, I cannot run
compiz anymore :(

I got this error first:

 gnome-window-decorator &GLX_EXT_texture_from_pixmap is not available
with direct rendering.

If I uncomment the lines of /usr/bin/compiz script to get the
recognition of  direct/indirect rendering (I had no need for this under
edgy...), I still have this errors when I run compiz:

[EMAIL PROTECTED]:~$ compiz --replace gconf

 gnome-window-decorator &GLX_EXT_texture_from_pixmap is not available with 
direct rendering.
GLX_EXT_texture_from_pixmap is available with indirect rendering.
/usr/bin/compiz.real: No stencil buffer. Clipping of transformed windows is not 
going to be correct when screen is transformed.
inotify_add_watch: No such file or directory
Segmentation fault (core dumped)
Avviso del window manager: Il valore «» nel database di configurazione non è 
valido per la scorciatoia «toggle_shaded»

(last line in italian says: value <<>> in configuration database is not
valid for the shortcut << toggle_shaded>>)

any hints?

BTW: if I try to run compiz thru desktop-effects, i get the same errors
but the first lines say:

nvidia hardware not available
gtk-window-decorator: Could not acquire decoration manager selection on screen 
0 display ":0.0"

and then again:

gtk-window-decorator: Could not acquire decoration manager selection on screen 
0 display ":0.0"
GLX_EXT_texture_from_pixmap is not available with direct rendering.
GLX_EXT_texture_from_pixmap is available with indirect rendering.
/usr/bin/compiz.real: No stencil buffer. Clipping of transformed windows is not 
going to be correct when screen is transformed.
inotify_add_watch: No such file or directory
Segmentation fault (core dumped)
Avviso del window manager: Il valore «» nel database di configurazione non è 
valido per la scorciatoia «toggle_shaded»

-- 
Some windows do not render with "Desktop Effects" enabled on some hardware
https://bugs.launchpad.net/bugs/89189
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