Re: Laptop screen blank when using second monitor

[Oliver Ruebenacker <curoli@xxxxxxxxx>]

     Hello,

On Tue, Oct 29, 2013 at 12:05 PM, Dale Dellutri <daledellutri@xxxxxxxxx> wrote:

On Tue, Oct 29, 2013 at 10:56 AM, Oliver Ruebenacker <curoli@xxxxxxxxx> wrote:

     Hello,

  Until this morning, my Lenovo Thinkpad T430 running KDE on Fedora 19 was working fine sitting on a base with a second monitor attached. I removed it from the base and connected another second monitor (a projector) and things were still fine. When I put it back into the base, the laptop screen went blank, and it was using only the second screen. When I remove it from the base, it uses the built-in screen, but as soon as I put it into the base, it only uses the second screen. Interestingly, when I restart, it uses both screens properly until after I log in.

  Any advice? Thanks!

In a terminal window, type:

  xrandr

to determine whether it thinks that the laptop screen and the external

monitor are connected or disconnected. 

[oruebenacker@localhost ~]$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS1 connected (normal left inverted right x axis y axis)
   1600x900       60.0 +   40.0 
   1024x768       60.0 
   800x600        60.3     56.2 
   640x480        59.9 
VGA1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 604mm x 342mm
   1920x1080      60.0*+
   1600x1200      60.0 
   1680x1050      60.0 
   1280x1024      75.0     60.0 
   1440x900       75.0     59.9 
   1280x960       60.0 
   1280x800       59.8 
   1152x864       75.0 
   1024x768       75.1     70.1     60.0 
   832x624        74.6 
   800x600        72.2     75.0     60.3     56.2 
   640x480        75.0     72.8     66.7     60.0 
   720x400        70.1 
LVDS-2 disconnected (normal left inverted right x axis y axis)
VGA-2 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
[oruebenacker@localhost ~]$ 
 

If the laptop screen is connected

but blank, then it sounds like a hardware problem.

  I'm not sure how it can be a hardware problem. The laptop screen is only blank if the second screen is connected and I am logged in. If I disconnect the second screen, it uses the builtin screen. If I restart it uses both screens next to each other until I log in.

Also, some laptops have a key that you can press to rotate through whether

all the screens are active or not.  Does the Lenovo have one?

  I'm not aware of it and have not needed it so far.

     Best,

     Oliver

--

Oliver Ruebenacker
IT Project Lead at PanGenX (http://www.pangenx.com)

Be always grateful, but never satisfied.

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