modesetting + glamor error

[Pete Wright]

hey there -

i am testing out the modesetting driver and have run into an issue when 
i force the glamor driver to be loaded in xorg.conf like so:

     Driver      "modesetting"
         Option      "AccelMethod" "glamor"
         Option      "SWcursor"    "on"
         Option     "AccelMethod" "sna"           # <str>
     BusID       "PCI:0:2:0"

after i startx the following warning is thrown in /var/log/Xorg.0.log:

[  6735.747] (WW) modeset(0): DRI2: glamor lacks support for pixmap 
import/export

When my window manager (mate) loads most fonts don't render and other 
artifacts happen.  If I remove the "SWcursor" stanza no mouse is 
visible.  here are what i hope are the relevant package versions (which 
I'm running from the xserver-next branch on github):

xorg-7.7_2
xorg-apps-7.7_2
xorg-docs-1.7.1,1
xorg-drivers-7.7_5
xorg-fonts-7.7_1
xorg-fonts-100dpi-7.7
xorg-fonts-75dpi-7.7
xorg-fonts-cyrillic-7.7
xorg-fonts-miscbitmaps-7.7
xorg-fonts-truetype-7.7_1
xorg-fonts-type1-7.7
xorg-libraries-7.7_2
xorg-macros-1.19.0
xorg-server-1.18.3,1

let me know if there is any additional info you need to help debug this 
- thanks!

-pete wright