How to find the second monitor connected to the laptop if the picture is displayed through the Intel core in Ubuntu?

Question

linux

Hello everyone!
Ubuntu 15.04 Laptop
asus n56vj
video there nv635m and Intel
Installed Nvidia Prime
Problem - the second monitor connected via HDMI is not detected in the mode when only the Intel core is active.
It's worth switching to Nvidia - the monitor is detected.
Can you tell me how to find a second monitor with an active Intel core?
xrandr output with active Nvidia core:

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
HDMI-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
   1920x1080      60.0*+   59.9     50.0     60.1     60.0     50.0 
   1680x1050      60.0 
   1600x900       60.0 
   1280x1024      75.0     60.0 
   1280x960       60.0 
   1280x800       59.8 
   1280x720       60.0     59.9     50.0 
   1024x768       75.0     60.0 
   1024x576       60.0 
   800x600        75.0     60.3 
   720x576        50.0     50.1 
   720x480        59.9     60.1 
   640x480        75.0     59.9     59.9 
LVDS1 connected primary 1920x1080+0+0 344mm x 194mm
   1920x1080      60.0*+   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 
VGA1 disconnected
VIRTUAL1 disconnected
  1680x1050 (0x2cb)  146.2MHz                                                                                                                                                                                                                                                 
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock   65.3KHz                                                                                                                                                                                               
        v: height 1050 start 1053 end 1059 total 1089           clock   60.0Hz                                                                                                                                                                                                 
  1280x1024 (0x2ce)  108.0MHz                                                                                                                                                                                                                                                 
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock   64.0KHz                                                                                                                                                                                               
        v: height 1024 start 1025 end 1028 total 1066           clock   60.0Hz                                                                                                                                                                                                 
  1280x960 (0x2cf)  108.0MHz                                                                                                                                                                                                                                                   
        h: width  1280 start 1376 end 1488 total 1800 skew    0 clock   60.0KHz                                                                                                                                                                                               
        v: height  960 start  961 end  964 total 1000           clock   60.0Hz
  1024x768 (0x2d5)   65.0MHz
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock   48.4KHz
        v: height  768 start  771 end  777 total  806           clock   60.0Hz
  800x600 (0x2d8)   40.0MHz
        h: width   800 start  840 end  968 total 1056 skew    0 clock   37.9KHz
        v: height  600 start  601 end  605 total  628           clock   60.3Hz
  640x480 (0x2de)   25.2MHz
        h: width   640 start  656 end  752 total  800 skew    0 clock   31.5KHz
        v: height  480 start  490 end  492 total  525           clock   59.9Hz

Here is the output with Intel active:

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
LVDS1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080      60.0*+   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 
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Contents of /var/log/Xorg.0.log - pastebin.com/dSg2vZjU
lspci | grep VGA:

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: NVIDIA Corporation GF108M [GeForce GT 635M] (rev ff)

I followed links like www.linuxrussia.com/2013/08/xrandr-linux-ubuntu.html and linuxnow.ru/view.php?id=103 . It didn’t help because either I didn’t understand something there or because xrandr does not see the desired monitor at all when connected with an active Intel core

Answer 1

Why Nvidia Prime? Bumblebee lets you dynamically switch between the apps you want.
Usually Nvidia works through Intel, that is, in any case, if the monitor is visible in some mode, then it should work with Intel separately.
I recommend demolishing Nvidia Prime and installing Bumblebee, I have such a configuration with another laptop.