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I have installed Ubuntu 13.04 in my laptop Sony Vaio Pro 13. This computer has an HDMI port and I've connected a VGA monitor using a HDMI/VGA converter that comes included in the laptop's package.

The graphics card is an Intel HD 4400 integrated for which I have installed the Intel Linux driver.

Thanks to that now I can detect the HDMI port and I can see in xrandr that it is successfully connected to the monitor. Take a look to the output:

Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1920x1080      60.0*+   40.0     59.9  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
HDMI1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 160mm x 90mm
   1024x768       60.0 +   75.1     70.1     60.0  
   1920x1080      60.0* 
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1440x900       75.0     59.9  
   1280x960       60.0  
   1280x800       59.9  
   1152x864       60.0  
   1280x720       60.0  
   800x600        72.2     75.0     60.3  
   720x480        59.9  
   640x480        72.8     75.0     66.7     60.0     59.9  720x400        70.1  
DP1 disconnected (normal left inverted right x axis y axis)

And I can see the display in the displays app of Ubuntu. However, it still doesn't work. There in no output in the monitor and it pops a "Not signal" message.

Btw, the monitor is an HP L1950g.

Do you have any advice or do you know what is happening? Thanks in advanced.

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