System does not recognise 7950 with dummy plug

[B.T.Coin]

I'm building my first mining rig and I set it up with one 7950 card to start with.
I connected my monitor to the 7950 and I could run cgminer and mine coins without any problems. So far so good.

Now I set my BIOS to use the integrated on-board graphics to run the monitor so the 7950 can be dedicated to mining.
Unfortunately, the 7950 does not work, even when I inserted a dummy plug

Running cgminer -n gives me the following info:

[2013-05-19 14:05:16] CL Platform 0 vendor: Advanced Micro Devices, Inc.

[2013-05-19 14:05:16] CL Platform 0 name: AMD Accelerated Parallel Processing

[2013-05-19 14:05:16] CL Platform 0 version: OpenCL 1.2 AMD-APP (1124.2)

[2013-05-19 14:05:16] Error -1: Getting Device IDs (num)
[2013-05-19 14:05:16] clDevicesNum returned error, no GPUs usable

[2013-05-19 14:05:16] 0 GPU devices max detected
[2013-05-19 14:05:16] USB all: found 7 devices - listing known devices

[2013-05-19 14:05:16] No known USB devices

Also GPU-Z does report there is a 7900-series card in the system but does not show any details for it.

Can anybody help me out?
I want to add a second card but I need to get this resolved first, as the second card will need a dummy plug as well and I'm afraid to run into the same problem.
I already uninstalled and re-installed the drivers, even different versions but no luck so far

[1715558764]

1715558764

[gti337]

Check here:

https://bitcointalk.org/index.php?topic=170470.0

[B.T.Coin]

I tried all of the things that are mentioned in that post and run into the same problems as all the others who tried.
After a lot of work I can get the card to mine but I can't monitor or change any of the settings. Also cgminer can't read the temps from the card or adjust anything.

I did a test where I booted the system with the monitor on the 7950 card and started mining, then I used remote-desktop to log into that PC and even over remote-desktop I could not see the cards temp or clockspeeds (using GPU-Z) so I guess it's hopeless.
I did notice that everybody reporting this problem is using Sandy bridge or Ivy bridge systems. Does anybody know if this can be solved when using an AMD FM2 motherboard? I'm looking into buying an ASUS F2A55-M LE board for my mining rig.
Any help would be much appreciated.

[oolongtes1369]

I had the same problem too. That's what I did:
1) Plug into your graphic card, start mining.
2) Unplug, plug into onboard display.

Make sure your set "auto" in BIOS for primary graphic option.

I'm using ASUS P8Z68-V LX

[dermo]

I had the same problem too. That's what I did:
1) Plug into your graphic card, start mining.
2) Unplug, plug into onboard display.

Make sure your set "auto" in BIOS for primary graphic option.

I'm using ASUS P8Z68-V LX

working but with --no-adl

if I unplug, plug with adl ati driver crash

[Larry666]

Try uninstalling drivers and reinstalling.