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I'm trying to run Debian Stretch, I tried installing Nvidia driver (the non-free one) and Intel driver, I tried to setup manually my Xorg.conf, but nothing changed. Even tried with nouveau, but nothing. It won't work. My motherboard see the connected PCI, they have their vga connected to a working scree (tested earlier)

giampli@test:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750 Ti] (rev a2)

But xrandr can't see the second VGA, it see only one screen.

giampli@test:~$ sudo xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected primary (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 521mm x 293mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1440x900      74.98    59.89  
   1280x1024     75.02    60.02  
   1280x720      60.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    72.81    59.94  

I can't really understand why. Excuse for my bad English, I'm not mother tongue.

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    Check /var/log/Xorg.0.log for errors (or any output) regarding the Nvidia driver. Maybe your configuration isn't being read at all. – Ferenc Wágner Oct 26 '17 at 7:35
  • @FerencWágner Now i think everything it's loaded: [ 4.513] (==) Using config file: "/etc/X11/xorg.conf" I also uploaded the complete log here pastebin.com/mqc1h9j9 I'm actually using nouveau and modesetting, they where the default driver installed – Marco Franceschini Oct 26 '17 at 9:08
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According to the linked Xorg.log (please edit your question, don't add new information in comments) the modesetting driver recognizes the Intel card and the attached screen via HDMI/DVI, but Nouveau doesn't seem to detect your NVIDIA graphics card.

Nouveau does support the GTX 750 Ti since 2015. Make sure both your kernel and the nouveau driver are the newest version.

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