Comment 3 for bug 1296315

Additional tests:

udlfb is blacklisted by default in trusty:
 grep udl /etc/modprobe.d/blacklist-framebuffer.conf
blacklist udlfb

Generic modesetting driver is also present by default:
dpkg -l | grep "^ii *xserver-xorg-video-modesetting"
ii xserver-xorg-video-modesetting 0.8.1-1build1 amd64 X.Org X server -- Generic modesetting driver

After reading the Kernel/MainlineBuilds page, I tried a mainline kernel
https://wiki.ubuntu.com/Kernel/MainlineBuilds

I didn't found my kernel version on the mapping page (Trusty not indicated)
http://kernel.ubuntu.com/~kernel-ppa/info/kernel-version-map.html

uname -a
Linux g75vw 3.13.0-19-generic #39-Ubuntu SMP Fri Mar 21 14:18:44 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

So I tried the kernel v3.13.7 as it seems the last of my version (configs-based-on-Ubuntu-3.13.0-19.40.patch)
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.7-trusty/
linux-headers-3.13.7-031307_3.13.7-031307.201403240156_all.deb
linux-headers-3.13.7-031307-generic_3.13.7-031307.201403240156_amd64.deb
linux-image-3.13.7-031307-generic_3.13.7-031307.201403240156_amd64.deb
(no linux-image-extra deb as it is mainline?)

After a dpkg -i *.deb and a reboot, I still don't get any progress...
(manually modprobe udl, and trying to unplug/plug again the monitor)

uname -a
Linux g75vw 3.13.7-031307-generic #201403240156 SMP Mon Mar 24 05:57:41 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Mar 24 11:39:11 g75vw kernel: [ 80.303538] usbcore: registered new interface driver udl
Mar 24 11:39:39 g75vw kernel: [ 107.757943] usb 4-3: USB disconnect, device number 3
Mar 24 11:39:48 g75vw kernel: [ 116.561490] usb 4-3: new SuperSpeed USB device number 6 using xhci_hcd
Mar 24 11:39:48 g75vw mtp-probe: checking bus 4, device 6: "/sys/devices/pci0000:00/0000:00:14.0/usb4/4-3"
Mar 24 11:39:48 g75vw mtp-probe: bus: 4, device: 6 was not an MTP device
Mar 24 11:39:48 g75vw kernel: [ 116.577674] usb 4-3: New USB device found, idVendor=17e9, idProduct=ff03
Mar 24 11:39:48 g75vw kernel: [ 116.577680] usb 4-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Mar 24 11:39:48 g75vw kernel: [ 116.577683] usb 4-3: Product: MB168B+
Mar 24 11:39:48 g75vw kernel: [ 116.577685] usb 4-3: Manufacturer: DisplayLink
Mar 24 11:39:48 g75vw kernel: [ 116.577688] usb 4-3: SerialNumber: DALMTF151588