With BT4 Final installed the video would be garbled while using the vesa driver, the video device is a Intel GMA X4500 (see lspci -vv output below). The Intel driver would refuse to load with a (EE) NO devices detected. After trying many different things I ended up doing to following to fix it:

apt-get install the following(not all may be necessary):

x11proto-core-dev
x11proto-fonts-dev
x11proto-gl-dev
x11proto-input-dev
x11proto-randr-dev
x11proto-render-dev
x11proto-video-dev
x11proto-xext-dev
x11proto-xf86dga-dev
x11proto-xf86dri-dev
x11proto-xf86misc-dev
x11proto-xinerama-dev
xserver-xorg-dev
libdrm-dev

#### Now do:

mkdir ~/build
cd ~/build

#OPTIONAL BACKUP: tar -cvvzf libdrm-backup.tgz `find / -name libdrm\*`


wget http://dri.freedesktop.org/libdrm/libdrm-2.4.20.tar.gz
tar -xvvzf libdrm-2.4.20.tar.gz
cd libdrm-2.4.20
./configure
make
make install

cd ~/build


wget http://xorg.freedesktop.org/archive/...l-2.7.1.tar.gz
tar -xvvzf xf86-video-intel-2.7.1.tar.gz
cd xf86-video-intel-2.7.1
./configure
make

#OPTIONAL BACKUP: tar -cvvzf ~build/x11modules.tgz /usr/lib/xorg/modules

cp src/.libs/intel_drv.so /usr/lib/xorg/modules/drivers


#backup and remove /usr/lib/libdrm*

ldd /usr/lib/xorg/modules/drivers/intel_drv.so
#make sure it is using /usr/local/lib/libdrm* and not other directories

#make sure your /etc/X11/xorg.conf is using the intel driver.

startx

-----------------------------

00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)
Subsystem: Biostar Microtech Int'l Corp Device 3103
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 27
Region 0: Memory at fe400000 (64-bit, non-prefetchable) [size=4M]
Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at dc00 [size=8]
Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+
Address: fee0300c Data: 4189
Capabilities: [d0] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [a4] PCIe advanced features <?>