Only the second monitor works

By Henry.Sleek

I am new to Ubuntu, and I am experiencing problems with monitors and Nvidia. I have Ubuntu 14.04 x64 (I cannot upgrade because I need that version for my robot) and an integrated Nvidia card in my laptop, a Nvidia GeForce GTX 950M. At the very beginning, plugging in an HDMI cable for using a second monitor, the second monitor was not detected. I installed Nvidia drivers and started messing around (probably too much), and now only the second monitor is detected, and in addition the touchpad doesn’t work, but the mouse and the keyboard do work.

Right now I am using Nvidia drivers 361.45.18 (I am not using the most recent 375.26 that I could use since I am not sure they would work in Ubuntu 14.04). I downloaded CompizConfig Settings Manager and in General Options -> Display Settings I untoggled ‘Detect Outputs’ (but if I toggle it back, nothing really changes) and forced two outputs, 1920×1080+0+0 and 1920×1080+1920+0, as suggested in some forums. Before doing this, a single desktop was stretched out on the two monitors: after doing it, everything was immediately working, and survived 4-5 reboots. But the day after, only the second screen worked, for mystical reasons. When I turn on the pc, the ‘Ubuntu’ logo appears on the laptop screen while loading, but then the login screen appears only on the second monitor: whether I plug or unplug the HDMI, nothing changes: the pc screen is really dark purple (you can see it’s on), but even if I unplug the HDMI, it stays so. Nothing appears there. And I can’t move windows anywhere, there is only one desktop. Both in Systems Settings and nvidia-settings only the LG external monitor is detected.

I can post this info here:

sudo lshw -c video

 *-display               
   description: 3D controller
   product: GM107M [GeForce GTX 950M]
   vendor: NVIDIA Corporation
   physical id: 0
   bus info: pci@0000:01:00.0
   version: a2
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list rom
   configuration: driver=nvidia latency=0
   resources: irq:134 memory:a3000000-a3ffffff memory:90000000-  9fffffff memory:a0000000-a1ffffff ioport:4000(size=128) memory:a4000000-a407ffff
  *-display
   description: VGA compatible controller
   product: Intel Corporation
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 06
   width: 64 bits
   clock: 33MHz
   capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
   configuration: driver=i915_bpo latency=0
   resources: irq:132 memory:a2000000-a2ffffff memory:b0000000-bfffffff ioport:5000(size=64)

and:

xrandr

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x    axis y axis) 480mm x 270mm
   1920x1080      60.0*+   59.9     50.0     60.1     60.0     50.0  
   1680x1050      60.0  
   1600x900       60.0  
   1440x900       59.9  
   1400x1050      60.0  
   1280x1024      75.0     60.0  
   1280x800       59.8  
   1280x720       60.0     59.9     50.0  
   1152x864       75.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   720x576        50.0  
   720x480        59.9  
   640x480        75.0     59.9     59.9  

I am scared to do any action since at least now it’s stable and I can work, but if I don’t have a second monitor, I can’t. So I need to solve this. Please, ask me anything that I should post, the output of any flag, since I don’t know precisely which can be useful. But please, help me.

Source:: http://askubuntu.com/questions/870575/only-the-second-monitor-works


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