Start cgminer only on the second card HOW? I have two video cards. My main card is a nvidia 650ti and my second is an AMD R9 280x. My monitor is connected to the nvidia and I use it for normal things. I want to start cgminer only on my second card - the AMD R9 280x. I tried with cgminer -d1 but it says:

ADL found less devices than opencl!
There is possibly more than one display attached to a GPU
Use the gpu map feature to reliably map OpenCL to ADL
WARNING: Number of OpenCL and ADL devices did not match!
Hardware monitoring may NOT match up with devices!


I saw that there is this command: 

--gpu-map &lt;arg&gt; - Map OpenCL to ADL device order manually, paired CSV (e.g. 1:0,2:1 maps OpenCL 1 to ADL 0, 2 to 1) 

I have tried it but I don't know exactly what arguments to use and it does not work.

How can I use the command to start cgminer only for my second card?
to maps gpus i use this script:

cgminer -n option

Timeout /t 3600


Make it a .bat file and put it in the same folder as you cgminer, then you can tell witch gpu that is 0,1,2... 

but you have to turn off power saving in windows to prevent you 280x form sleep, if you don't have a dummy-plug or an screen put to that device.

I used this guide for all start up information's: http://www.cryptobadger.com/build-your-own-litecoin-mining-rig/

Regards

EDIT: and when you use the -d command remember to have a space before the number.