See picture showing the issue here: <a href="http://img258.imageshack.us/img258/5289/img3410.jpg" target="_blank">http://img258.imageshack.us/img258/5289/img3410.jpg</a> Things seem to be aligned but there are black horizontal lines and dragging a window (or menu) leaves trails. Might be some sort of weird line rendering wrapping problem. Basic install/config steps (that I can remember): 1. sudo apt-get install xserver-xorg-video-displaylink 2. blacklist bitblit/font/tileblit/fbcon in /etc/modprobe.d/fbcon.conf 3. sudo depmod -a 4. sudo update-initramfs -u 5. changed GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash vga=normal nomodeset” in /etc/default/grub 6. sudo update-grub 7. reboot 8. created basic $HOME/xorg.conf.d/xorg.conf - just displaylink screen no other screens/monitors 9. sudo apt-get install fluxbox 10. sudo xinit fluxbox -- :1 -configdir $HOME/xorg.conf.d/ -sharevts dmesg: [ 32.015149] udlfb: module is from the staging directory, the quality is unknown, you have been warned. [ 32.016067] DisplayLink device attached [ 32.016193] ret control msg 0: 4 1501fffffff1 [ 32.096191] EDID XRES 1024 YRES 600 [ 32.096194] INIT VIDEO 0 800 480 [ 32.096196] INIT VIDEO 1 1024 768 [ 32.096197] INIT VIDEO 2 1280 1024 [ 32.096199] INIT VIDEO 3 1400 1050 [ 32.096200] INIT VIDEO 0 800 480 [ 32.096201] INIT VIDEO 1 1024 768 [ 32.096203] INIT VIDEO 2 1280 1024 [ 32.096564] ret control msg 1 (STD_CHANNEL): 16 [ 32.096687] ret bulk 2: 156 156 [ 32.096812] ret bulk 3: 0 [ 32.096814] found valid mode...19841 [ 32.097697] screen base allocated !!! [ 32.099412] colormap allocated [ 32.109347] lp: driver loaded but no devices found [ 32.110600] usbcore: registered new interface driver udlfb [ 32.110603] VMODES initialized Framebuffer appears as /dev/fb1 /var/log/Xorg.1.log: ... (II) DL(0): EDID vendor "NAV", prod id 16 (II) DL(0): EDID for output DoubleSight (II) DL(0): Manufacturer: NAV Model: 10 Serial#: 700 (II) DL(0): Year: 2008 Week: 30 (II) DL(0): EDID Version: 1.3 (II) DL(0): Digital Display Input (II) DL(0): Max Image Size [cm]: horiz.: 8 vert.: 5 (II) DL(0): Gamma: 2.20 (II) DL(0): No DPMS capabilities specified (II) DL(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4 (II) DL(0): First detailed timing is preferred mode (II) DL(0): redX: 0.640 redY: 0.330 greenX: 0.300 greenY: 0.600 (II) DL(0): blueX: 0.150 blueY: 0.060 whiteX: 0.312 whiteY: 0.329 (II) DL(0): Manufacturer's mask: 0 (II) DL(0): Supported detailed timing: (II) DL(0): clock: 50.4 MHz Image Size: 153 x 90 mm (II) DL(0): h_active: 1024 h_sync: 1048 h_sync_end 1184 h_blank_end 1244 h_border: 0 (II) DL(0): v_active: 600 v_sync: 600 v_sync_end 603 v_blanking: 625 v_border: 0 (II) DL(0): Ranges: V min: 55 V max: 65 Hz, H min: 35 H max: 45 kHz, PixClock max 60 MHz (II) DL(0): Monitor name: DoubleSight (II) DL(0): Serial No: U70T08100266 (II) DL(0): EDID (in hex): (II) DL(0): 00ffffffffffff0038361000bc020000 (II) DL(0): 1e120103800805780aee91a3544c9926 (II) DL(0): 0f505400000001010101010101010101 (II) DL(0): 010101010101b01300dc405819201888 (II) DL(0): 0300995a0000001e000000fd00374123 (II) DL(0): 2d06000a202020202020000000fc0044 (II) DL(0): 6f75626c6553696768740a0a000000ff (II) DL(0): 005537305430383130303236360a0070 (II) DL(0): EDID vendor "NAV", prod id 16 (II) DL(0): Using hsync ranges from config file (II) DL(0): Using vrefresh ranges from config file (II) DL(0): Printing DDC gathered Modelines: (II) DL(0): Modeline "1024x600"x0.0 50.40 1024 1048 1184 1244 600 600 603 625 +hsync +vsync (40.5 kHz) (II) DL(0): EDID vendor "NAV", prod id 16 (II) DL(0): Printing probed modes for output DoubleSight (II) DL(0): Modeline "1024x600"x64.8 50.40 1024 1048 1184 1244 600 600 603 625 +hsync +vsync (40.5 kHz) (II) DL(0): Output DoubleSight connected (II) DL(0): Using user preference for initial modes (II) DL(0): Output DoubleSight using initial mode 1024x600 (II) DL(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated. (--) DL(0): Virtual size is 1024x600 (pitch 0) (**) DL(0): Driver mode "1024x600": 50.4 MHz (scaled from 0.0 MHz), 40.5 kHz, 64.8 Hz (II) DL(0): Modeline "1024x600"x64.8 50.40 1024 1048 1184 1244 600 600 603 625 +hsync +vsync (40.5 kHz) (**) DL(0): Display dimensions: (190, 115) mm (WW) DL(0): Probed monitor is 80x50 mm, using Displaysize 190x115 mm (**) DL(0): DPI set to (136, 132) (==) DL(0): Backing store disabled (==) DL(0): DPMS enabled (II) DL(0): RandR 1.2 enabled, ignore the following RandR disabled message. (--) RandR disabled ...there is more if you want it $ uname -a Linux q6600 2.6.32-25-generic #44-Ubuntu SMP Fri Sep 17 20:05:27 UTC 2010 x86_64 GNU/Linux Any thoughts? -PG