display port doesn't work

Hi all,

In these days I am trying to add another monitor to my computer for dual head. However, it looks like that my display ports don’t work. The basic condition is as follow:

Dell Precision T3500
1 DVI port
2 display ports

I could not find information about either DVI or display port by using the command xrandr -q:

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 320 x 240, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
1920x1080 50.0*
1400x1050 51.0 52.0
1280x1024 53.0 54.0
1280x960 55.0
1152x864 56.0
1024x768 57.0 58.0 59.0
832x624 60.0
800x600 61.0 62.0 63.0 64.0
700x525 65.0 66.0
640x480 67.0 68.0 69.0 70.0
512x384 71.0 72.0
400x300 73.0
320x240 74.0 75.0

Is there any idea to solve the problem?

I appreciate your help.


Hello Jerry,

I see this is your first post here, thus welcome to these forums.

I am in no way a display guru, but I hope they will show up soon to help you. In the mean time I will try to tell you a few things that might help others in helping you.
. Allways tell which version of openSUSE you are using (most of us have no crystal balls :wink: ). And when there is the slightest possibility that the desktop type is involved, do not forgot to mention KDE, Gnome or other also.
. When you next time post computer output (like your* xrandr -q *above), please do so between CODE tags Posting in Code Tags - A Guide , you will see that that maintains the column output xrandr creates, thus increasing the readabilty enormous. And please while you copy/paste your computer text between the CODE tags, do so uncluding prompt and command given. That also gives information without you having to mention it seperatly.

Hi Henk,

Thanks a lot.


You are welcome, but it would be much better if someone started helping you with your problem :wink:

Hello Jerry

It might be useful to know the graphics card details for a start.

  1. Open a terminal window, and type this command
/usr/sbin/hwinfo --gfxcard

Cut and paste the output here. (Use CODE tags as Henk has already requested). It makes the output much easier to read.

  1. When you executed xrandr, was your second display attached?

  2. The Xorg.0.log file will contain a lot of useful output concerning what went on during the X-server startup. With your second display attached, reboot, and have a look at this output. Cut and paste the contents, then upload to

SUSE Paste

It will give you a URL to link to. Post that here. (It saves screeds of output within the thread).