plugable USB 3.0 UGA not working in Linux VM

[samjam]

relevant parts of X0rg.0.log are:

[   328.393] 
X.Org X Server 1.15.1
Release Date: 2014-04-13
[   328.393] X Protocol Version 11, Revision 0
[   328.393] Build Operating System: Linux 3.2.0-76-generic x86_64 Ubuntu
[   328.393] Current Operating System: Linux sojojojo 3.19.0-59-generic #66~14.04.1-Ubuntu SMP Fri May 13 17:27:10 UTC 2016 x86_64
[   328.393] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.19.0-59-generic root=UUID=25e636ac-092d-4710-b2b7-d5aac7ba96eb ro quiet splash
[   328.393] Build Date: 12 February 2015  02:49:29PM
[   328.393] xorg-server 2:1.15.1-0ubuntu2.7 (For technical support please see http://www.ubuntu.com/support) 
[   328.393] Current version of pixman: 0.30.2
[   328.393] 	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
[   328.393] Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[   328.394] (==) Log file: "/var/log/Xorg.0.log", Time: Tue Jun 14 15:41:43 2016
[   328.394] (==) Using config file: "/etc/X11/xorg.conf"
[   328.394] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[   328.394] (==) ServerLayout "X.org Configured"
[   328.394] (**) |-->Screen "Screen0" (0)
[   328.394] (**) |   |-->Monitor "Monitor0"
[   328.395] (**) |   |-->Device "Card1"
[   328.395] (**) |-->Input Device "Mouse0"
[   328.395] (**) |-->Input Device "Keyboard0"
[   328.395] (==) Automatically adding devices
[   328.395] (==) Automatically enabling devices
[   328.395] (==) Automatically adding GPU devices
[   328.395] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/100dpi/" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/100dpi" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.
[   328.395] 	Entry deleted from font path.
[   328.395] (**) FontPath set to:
	/usr/share/fonts/X11/misc,
	/usr/share/fonts/X11/Type1,
	built-ins,
	/usr/share/fonts/X11/misc,
	/usr/share/fonts/X11/Type1,
	built-ins
[   328.395] (**) ModulePath set to "/usr/lib/xorg/modules"
[   328.395] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
[   328.395] (WW) Disabling Mouse0
[   328.395] (WW) Disabling Keyboard0
[   328.395] (II) Loader magic: 0x564ce722ad40
[   328.395] (II) Module ABI versions:
[   328.395] 	X.Org ANSI C Emulation: 0.4
[   328.395] 	X.Org Video Driver: 15.0
[   328.395] 	X.Org XInput driver : 20.0
[   328.395] 	X.Org Server Extension : 8.0
[   328.396] (II) xfree86: Adding drm device (/dev/dri/card0)
[   328.396] (II) xfree86: Adding drm device (/dev/dri/card1)
[   328.425] (--) PCI:*(0:0:15:0) 15ad:0405:15ad:0405 rev 0, Mem @ 0xec000000/67108864, 0xfe000000/8388608, I/O @ 0x00001070/16, BIOS @ 0x????????/32768
[   328.425] (--) PCI: (0:3:0:0) 102b:0534:1028:04fa rev 0, Mem @ 0xea000000/16777216, 0xfd4f8000/16384, 0xfc800000/8388608
[   328.425] Initializing built-in extension Generic Event Extension
[   328.425] Initializing built-in extension SHAPE
[   328.425] Initializing built-in extension MIT-SHM
[   328.425] Initializing built-in extension XInputExtension
[   328.425] Initializing built-in extension XTEST
[   328.425] Initializing built-in extension BIG-REQUESTS
[   328.425] Initializing built-in extension SYNC
[   328.425] Initializing built-in extension XKEYBOARD
[   328.425] Initializing built-in extension XC-MISC
[   328.425] Initializing built-in extension SECURITY
[   328.425] Initializing built-in extension XINERAMA
[   328.425] Initializing built-in extension XFIXES
[   328.425] Initializing built-in extension RENDER
[   328.425] Initializing built-in extension RANDR
[   328.425] Initializing built-in extension COMPOSITE
[   328.425] Initializing built-in extension DAMAGE
[   328.425] Initializing built-in extension MIT-SCREEN-SAVER
[   328.425] Initializing built-in extension DOUBLE-BUFFER
[   328.425] Initializing built-in extension RECORD
[   328.425] Initializing built-in extension DPMS
[   328.425] Initializing built-in extension Present
[   328.425] Initializing built-in extension DRI3
[   328.426] Initializing built-in extension X-Resource
[   328.426] Initializing built-in extension XVideo
[   328.426] Initializing built-in extension XVideo-MotionCompensation
[   328.426] Initializing built-in extension SELinux
[   328.426] Initializing built-in extension XFree86-VidModeExtension
[   328.426] Initializing built-in extension XFree86-DGA
[   328.426] Initializing built-in extension XFree86-DRI
[   328.426] Initializing built-in extension DRI2
[   328.426] (II) "glx" will be loaded. This was enabled by default and also specified in the config file.
[   328.426] (WW) "xmir" is not to be loaded by default. Skipping.
[   328.426] (II) LoadModule: "glx"
[   328.426] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[   328.427] (II) Module glx: vendor="X.Org Foundation"
[   328.427] 	compiled for 1.15.1, module version = 1.0.0
[   328.427] 	ABI class: X.Org Server Extension, version 8.0
[   328.427] (==) AIGLX enabled
[   328.428] Loading extension GLX
[   328.428] (II) LoadModule: "fbdev"
[   328.428] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so
[   328.428] (II) Module fbdev: vendor="X.Org Foundation"
[   328.428] 	compiled for 1.15.0, module version = 0.4.4
[   328.428] 	Module class: X.Org Video Driver
[   328.428] 	ABI class: X.Org Video Driver, version 15.0
[   328.428] (II) FBDEV: driver for framebuffer: fbdev
[   328.428] (++) using VT number 8

[   328.433] (WW) Falling back to old probe method for fbdev
[   328.433] (II) Loading sub module "fbdevhw"
[   328.433] (II) LoadModule: "fbdevhw"
[   328.433] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[   328.433] (II) Module fbdevhw: vendor="X.Org Foundation"
[   328.433] 	compiled for 1.15.1, module version = 0.0.2
[   328.433] 	ABI class: X.Org Video Driver, version 15.0
[   328.433] (II) FBDEV(0): using /dev/fb1
[   328.433] (**) FBDEV(0): Depth 16, (--) framebuffer bpp 16
[   328.433] (==) FBDEV(0): RGB weight 565
[   328.433] (==) FBDEV(0): Default visual is TrueColor
[   328.433] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0)
[   328.433] (II) FBDEV(0): hardware: evdidrmfb (video memory: 3072kB)
[   328.434] (**) FBDEV(0): Option "fbdev" "/dev/fb1"
[   328.434] (II) FBDEV(0): checking modes against framebuffer device...
[   328.434] (II) FBDEV(0): checking modes against monitor...
[   328.434] (--) FBDEV(0): Virtual size is 1024x768 (pitch 1024)
[   328.434] (**) FBDEV(0):  Built-in mode "current"
[   328.434] (==) FBDEV(0): DPI set to (96, 96)
[   328.434] (II) Loading sub module "fb"
[   328.434] (II) LoadModule: "fb"
[   328.434] (II) Loading /usr/lib/xorg/modules/libfb.so
[   328.434] (II) Module fb: vendor="X.Org Foundation"
[   328.434] 	compiled for 1.15.1, module version = 1.0.0
[   328.434] 	ABI class: X.Org ANSI C Emulation, version 0.4
[   328.434] (**) FBDEV(0): using shadow framebuffer
[   328.434] (II) Loading sub module "shadow"
[   328.434] (II) LoadModule: "shadow"
[   328.434] (II) Loading /usr/lib/xorg/modules/libshadow.so
[   328.435] (II) Module shadow: vendor="X.Org Foundation"
[   328.435] 	compiled for 1.15.1, module version = 1.1.0
[   328.435] 	ABI class: X.Org ANSI C Emulation, version 0.4
[   328.436] (==) FBDEV(0): Backing store enabled
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
...
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[   328.436] (EE) FBDEV(0): FBIOPUTCMAP: Invalid argument
[   328.436] (==) FBDEV(0): DPMS enabled
[   328.436] (==) RandR enabled
[   328.436] (II) Found 2 VGA devices: arbiter wrapping enabled
[   328.445] (II) SELinux: Disabled on system
[   328.446] (II) AIGLX: Screen 0 is not DRI2 capable
[   328.446] (EE) AIGLX: reverting to software rendering
[   328.467] (II) AIGLX: Loaded and initialized swrast
[   328.467] (II) GLX: Initialized DRISWRAST GL provider for screen 0
[   328.497] (II) XKB: reuse xkmfile /var/lib/xkb/server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm
[   328.502] (II) config/udev: Adding input device Power Button (/dev/input/event0)
[   328.502] (**) Power Button: Applying InputClass "evdev keyboard catchall"
[   328.502] (II) LoadModule: "evdev"
[   328.502] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
...