XINERAMA vs XRANDR and other issues MultiGPU

[mbalino]

Hello guys

I have this configuration

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inxi -FGx
System:    Host: Mint-PC Kernel: 3.17.3-031703-generic x86_64 (64 bit, gcc: 4.6.3) 
           Desktop: KDE 4.13.3 (Qt 4.8.6) Distro: Linux Mint 17 Qiana
Machine:   Mobo: ASUSTeK model: SABERTOOTH X79 version: Rev 1.xx Bios: American Megatrends version: 4801 date: 07/25/2014
CPU:       Quad core Intel Core i7-4820K CPU (-HT-MCP-) cache: 10240 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 35998.8 
           Clock Speeds: 1: 3600.00 MHz 2: 3600.00 MHz 3: 3600.00 MHz 4: 3600.00 MHz 5: 3600.843 MHz 6: 3600.00 MHz 7: 3600.984 MHz 8: 3588.046 MHz
Graphics:  Card-1: Advanced Micro Devices [AMD/ATI] Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X] bus-ID: 01:00.0 
           Card-2: Advanced Micro Devices [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X] bus-ID: 02:00.0 
           X.Org: 1.15.1 driver: fglrx Resolution: 1920x1080, 1920x1080 
           GLX Renderer: AMD Radeon HD 7700 Series, AMD Radeon HD 7900 Series GLX Version: 4.3.12798 - CPC 13.35.1005 Direct Rendering: Yes
Audio:     Card-1: Intel C600/X79 series chipset High Definition Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0
           Card-2: Advanced Micro Devices [AMD/ATI] Tahiti XT HDMI Audio [Radeon HD 7970 Series] driver: snd_hda_intel bus-ID: 01:00.1
           Card-3: Advanced Micro Devices [AMD/ATI] Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series] driver: snd_hda_intel bus-ID: 02:00.1
           Card-4: KYE Systems (Mouse Systems) driver: USB Audio usb-ID: 0458:708c
           Sound: Advanced Linux Sound Architecture ver: k3.17.3-031703-generic
Network:   Card: Intel 82579V Gigabit Network Connection driver: e1000e ver: 2.3.2-k port: f040 bus-ID: 00:19.0
           IF: eth0 state: up speed: 1000 Mbps duplex: full mac: 74:d0:2b:28:00:ca
Drives:    HDD Total Size: 2250.5GB (14.7% used) 1: id: /dev/sda model: ST2000DM001 size: 2000.4GB 
           2: id: /dev/sdb model: Samsung_SSD_840 size: 250.1GB 
Partition: ID: / size: 231G used: 27G (12%) fs: btrfs ID: /boot size: 323M used: 87M (29%) fs: ext2 
           ID: /home size: 420G used: 164G (40%) fs: btrfs ID: swap-1 size: 2.00GB used: 0.00GB (0%) fs: swap 
RAID:      No RAID devices detected - /proc/mdstat and md_mod kernel raid module present
Sensors:   System Temperatures: cpu: 35.0C mobo: N/A gpu: 38.00C 42.00C 
           Fan Speeds (in rpm): cpu: N/A 
Info:      Processes: 352 Uptime: 49 min Memory: 2183.7/32115.4MB Runlevel: 2 Gcc sys: 4.8.2 Client: Shell inxi: 1.8.4 

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xrandr -q
Screen 1: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 disconnected (normal left inverted right x axis y axis)
DFP3 disconnected (normal left inverted right x axis y axis)
DFP4 disconnected (normal left inverted right x axis y axis)
DFP5 disconnected (normal left inverted right x axis y axis)
DFP6 disconnected (normal left inverted right x axis y axis)
DFP7 disconnected (normal left inverted right x axis y axis)
DFP8 disconnected (normal left inverted right x axis y axis)
DFP9 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
   1920x1080      60.0*+   50.0     59.9     60.1     50.0     60.0  
   1600x1200      60.0  
   1776x1000      50.0     59.9     50.0     60.0  
   1680x1050      50.0     60.0  
   1400x1050      60.0     50.0  
   1600x900       60.0     50.0  
   1280x1024      50.0     75.0     60.0  
   1440x900       50.0     75.0     59.9  
   1280x960       50.0     60.0  
   1280x800       50.0     59.8  
   1152x864       50.0     59.9     75.0  
   1280x768       50.0     59.8  
   1280x720       60.0     50.0     59.9  
   1024x768       50.0     75.0     70.1     60.0  
   1152x648       50.0     59.9  
   800x600        50.0     72.2     75.0     60.3     56.2  
   720x576        59.9     50.0  
   720x480        50.0     60.0     59.9  
   640x480        50.0     75.0     72.8     66.6     59.9  
DFP10 disconnected (normal left inverted right x axis y axis)
CRT1 disconnected (normal left inverted right x axis y axis)

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xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DFP1 disconnected (normal left inverted right x axis y axis)
DFP2 disconnected (normal left inverted right x axis y axis)
DFP3 disconnected (normal left inverted right x axis y axis)
DFP4 disconnected (normal left inverted right x axis y axis)
DFP5 disconnected (normal left inverted right x axis y axis)
DFP6 disconnected (normal left inverted right x axis y axis)
DFP7 disconnected (normal left inverted right x axis y axis)
DFP8 disconnected (normal left inverted right x axis y axis)
DFP9 disconnected (normal left inverted right x axis y axis)
DFP10 disconnected (normal left inverted right x axis y axis)
CRT1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 290mm
   1920x1080      60.0*+
   1680x1050      60.0  
   1400x1050      60.0  
   1600x900       60.0  
   1280x1024      75.0     60.0  
   1440x900       59.9  
   1280x960       75.0     60.0  
   1280x800       59.8  
   1152x864       60.0     75.0  
   1280x768       59.8  
   1280x720       60.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3     56.2  
   640x480        75.0     59.9  

LG IPS LED 24EA53 connected as primary to Tahiti 7970
SyncMaster LED SMBX2350 connected as secondary to Cape Verde 7770

I have tried these two options:
1. XINERAMA -> works perfectly fine, moving windows between screen BUT NO effects can be activated, it crashed kwin
2. XRANDR - awesome effects in both screens, BUT NO moving windows nor creating links in the 2nd monitor

I would like to have XRANDR like XINERAMA one big desktop moving windows between them.

It is possible?

[mbalino]

Nobody?
Anybody?
Somebody?