I tried many combinations with xrandr command under lubuntu 12.04 to setup my three monitors

• DVI (DELL 1) left detected as HDMI1
• HDMI (LG E2290) middle detected as HDMI2
• VGA (DELL 2) right detected as VGA1

I can get the display with fix 1280x1024 on all the monitors. But once I setup 1280x1024 + 1920x1080 + 1280x1024, I get blank screen on all the monitors. Sometimes it throws crts fail error instead of blanking out.

Anyone have similar issues? any solutions/workarounds?

P.S. I can setup two monitors using 1280x1280 and 1920x1080 P.S.S. HDMI2 required at least 1920x1080 to display sharp picture.

Outputs (it seems graphic card supports up to 8192x8192):

xrandr
Screen 0: minimum 320 x 200, current 3840 x 1024, maximum 8192 x 8192
VGA1 connected 1280x1024+2560+0 (normal left inverted right x axis y axis) 338mm x 270mm
1280x1024      60.0*+   75.0
1152x864       75.0
1024x768       75.1     60.0
800x600        75.0     60.3
640x480        75.0     60.0
720x400        70.1
HDMI1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024      60.0*+   75.0
1152x864       75.0
1024x768       75.1     60.0
800x600        75.0     60.3
640x480        75.0     60.0
720x400        70.1
HDMI2 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080      60.0 +
1680x1050      60.0
1280x1024      75.0     60.0*
1152x864       75.0
1024x768       75.1     60.0
800x600        75.0     60.3
640x480        75.0     60.0
720x400        70.1
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)

3 CRTs (0,1 VGA, 0,1,2 for other HDMI)

xrandr --verbose
VGA1 connected 1280x1024+2560+0 (0x47) normal (normal left inverted right x axis y axis) 338mm x 270mm
Identifier: 0x42
Timestamp:  51324
Subpixel:   unknown
Gamma:      1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC:       0
CRTCs:      0 1
...
HDMI1 connected 1280x1024+0+0 (0x47) normal (normal left inverted right x axis y axis) 376mm x 301mm
Identifier: 0x43
Timestamp:  51324
Subpixel:   unknown
Gamma:      1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC:       1
CRTCs:      0 1 2
...
HDMI2 connected 1280x1024+1280+0 (0x47) normal (normal left inverted right x axis y axis) 477mm x 268mm
Identifier: 0x44
Timestamp:  51324
Subpixel:   unknown
Gamma:      1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC:       2
CRTCs:      0 1 2

Below command fails:

xrandr --output VGA1 --auto --output HDMI2 --auto --left-of VGA1 --output HDMI1 --auto --left-of HDMI2

Below command passes:

xrandr --output VGA1 --auto --output HDMI2 --mode 1280x1024 --rate 60.0 --left-of VGA1 --output HDMI1 --auto --left-of HDMI2

Graphic card VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09)