FYI: I just downgraded the xserver packages back to
those of "testing" and the Sony screen works again.
steve@riemann{~}dpkg --list 'xserver*' |grep ^ii
ii xserver-common 2:1.6.5-1 common files used by various X servers
ii xserver-xorg 1:7.4+4 the X.Org X server
ii xserver-xorg-core 2:1.6.5-1 Xorg X server - core server
ii xserver-xorg-input-evdev 1:2.2.5-1 X.Org X server -- evdev input driver
ii xserver-xorg-input-kbd 1:1.3.2-4 X.Org X server -- keyboard input driver
ii xserver-xorg-input-mouse 1:1.4.0-4 X.Org X server -- mouse input driver
ii xserver-xorg-video-ati 1:6.12.3-1 X.Org X server -- ATI display driver wrapper
ii xserver-xorg-video-mach64 6.8.2-1 X.Org X server -- ATI Mach64 display driver
ii xserver-xorg-video-openchrome 1:0.2.904+svn812-1 X.Org X server -- VIA display driver
ii xserver-xorg-video-r128 6.8.1-1 X.Org X server -- ATI r128 display driver
ii xserver-xorg-video-radeon 1:6.12.3-1 X.Org X server -- ATI Radeon display driver
ii xserver-xorg-video-vesa 1:2.2.1-1 X.Org X server -- VESA display driver
-Steve
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