Loose xfce desktop when HDMI disconnected

[Wirezfree]

Hi,

I have just installed LL 2.2 on a new Intel based mini PC.
I have it connected directly to a monitor(input #2) via HDMI
The monitors got 2 HDMI inputs, input #1 is my main PC.

If I use the the monitors "switch source input" I can switch between the 2 PC's,
However If I switch from the "New" PC to the other PC and back I loose the
"New PC's" Desktop, I go back and it's black.
If I do a crt alt f3, I can get a system prompt and do a restart of the Desktop.

The other PC is fine, I can go back to that and it's fine, that is running LL 2.0

So the new PC does not like having it's HDMI output switched.

It's not screensaver/display settings in LL 2.2,
I can leave the New PC connected to display for periods of time, screen goes blank
move mouse, tap keyboard and it's back.

Any ideas welcome. (inxi -F below)

Thanks... Dave

Code:

dave@jetway1:~$ inxi -F
System:    Host: jetway1 Kernel: 3.17.0-linuxlite x86_64 (64 bit) Desktop: Xfce 4.11.6 Distro: Ubuntu 14.04 trusty
Machine:   Mobo: NP93B model: NP93B version: 1.0 Bios: American Megatrends version: BAR3BA02 date: 09/16/2014
CPU:         Dual core Intel Celeron CPU N2807 (-MCP-) cache: 1024 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx)
                Clock Speeds: 1: 1919.519 MHz 2: 1814.500 MHz
Graphics:  Card: Intel ValleyView Gen7 X.Org: 1.15.1 drivers: intel (unloaded: fbdev,vesa) Resolution: [email protected]
                GLX Renderer: Mesa DRI Intel Bay Trail GLX Version: 3.0 Mesa 10.1.3
Audio:       Card: Intel ValleyView High Definition Audio Controller driver: snd_hda_intel Sound: ALSA ver: k3.17.0-linuxlite
Network:   Card-1: Realtek RTL8723BE PCIe Wireless Network Adapter driver: rtl8723be
                IF: wlan0 state: up mac: 40:e2:30:87:a9:c5
                Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
                IF: p1p1 state: down mac: 00:30:18:c5:08:17
Drives:      HDD Total Size: 123.9GB (3.9% used) 1: id: /dev/sda model: Samsung_SSD_840 size: 120.0GB
                2: USB id: /dev/sdb model: USB_DISK size: 3.9GB
Partition:   ID: / size: 20G used: 4.3G (23%) fs: ext4 ID: /home size: 20G used: 148M (1%) fs: ext4
                ID: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap
RAID:       No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors:   System Temperatures: cpu: 33.0C mobo: N/A
                Fan Speeds (in rpm): cpu: N/A
Info:         Processes: 173 Uptime: 2 min Memory: 315.7/1881.8MB Client: Shell (bash) inxi: 1.9.17