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RPI DisplayLink Dual Monitor setup (DL 165 chipset)

DisplayLink Plugable USB-VGA-165
modprobe udlfb

this modified module allows you to use xrandr
download con2fb.c and compile
gcc -o con2fb con2fb.c

chmod a+x con2fb cp to /usr/bin/ con2fb 1 6
(multiuser)
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xorg.conf

needs driver! x11-drivers/xf86-video-fbdev
Section "Device" 
 # RPi builtin video, framebuffer 0
   Identifier "Raspberry Pi FBDEV"
   Driver "fbdev"
   Option "fbdev" "/dev/fb0"
   Option "ShadowFB" "off"
   Option "SwapbuffersWait" "true"
 EndSection
 
 Section "Device"
 # USB DisplayLink video, framebuffer 1
   Identifier "uga"
   Driver "fbdev"
   Option "fbdev" "/dev/fb1"
   Option "ShadowFB" "off"
 EndSection
 
 Section "Monitor"
 # Primary monitor.
   Identifier "PrimaryMonitor"
 EndSection
 
 Section "Monitor"
 # Secondary monitor.
   Identifier "SecondaryMonitor"
 EndSection
 
 Section "Screen"
   Identifier "primary"
   Device "Raspberry Pi FBDEV"
   Monitor "PrimaryMonitor"
 EndSection
 
 Section "Screen"
   Identifier "secondary"
   Device "uga"
   Monitor "SecondaryMonitor"
 EndSection
 
 Section "ServerLayout"
   Identifier "default"
   Screen 0 "primary" 0 0
   Screen 1 "secondary" RightOf "primary"
   Option   "Xinerama" "1"  # enable XINERAMA extension.  Default is disabled.
 EndSection 

Accelerated X driver

An accelerated x.org video driver is available (fbturbo), though this is limited to hardware accelerated window moving/scrolling on the Raspberry Pi: install x11-drivers/xf86-video-fbturbo (mrueg overlay) Then add this to /etc/X11/xorg.conf (create if it does not already exist):
Section "Device"
     Identifier "Raspberry Pi FBDEV"
     Driver "fbturbo"
     Option "fbdev" "/dev/fb0"
     Option "SwapbuffersWait" "true"
 EndSection

dmesg
[75659.958923] udlfb: /dev/fb1 FB_BLANK mode 1 --> 0
 [75659.959043] udlfb: set_par mode 1280x1024

Product link: http://plugable.com/products/usb-vga-165/ buy @ amazon

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