<core_client_version>6.10.58</core_client_version>
<![CDATA[
<message>
- exit code -150 (0xffffff6a)
</message>
<stderr_txt>
Sieve started: 28237030000000000 <= p < 28237036000000000
Thread 0 starting
Detected GPU 0: Device Emulation (CPU)
Detected compute capability: 9999.9999
Detected emulator! We can't use that!
Sleeping 10 minutes to give the server a break.
19:59:12 (5756): called boinc_finish

</stderr_txt>
]]>
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I have a laptop with NVIDIA OPTIMUS Technology.
the machine has 2 GPUs
Intel GMA HD Grafikkarte
GeForce GT 540M
BOINC show:NVIDIA GPU 0: GeForce GT 540M (driver version unknown, CUDA version 3010, compute capability 2.1, 994MB, 172 GFLOPS peak)

The machine has run 2 wu's correct and next failed
have a look at hostid=187527
@Keng6:maybe GPU detection part must be corrected in our app

heinz
____________

"Device emulation" ?

I ran into a similar problem when I tried to run PPS CAL tasks on a dual-GPU laptop. With a Mac it's easy, albeit slow; the one in question for me was an HP Pavilion dv6 with a similar Intel chip and an ATi HD5450. Once the GMA was disabled, the computer freaked out. It stopped recognizing that it had a graphics card.

So with your situation, BOINC seems to be recognizing your GPU, right?

As it's fairly new technology, I wouldn't expect BOINC to work perfectly with it just yet. Hence you see "CAL ATi Unknown" on some host pages. OPTIMUS is pretty recent, no? The problems I described were also on a Win7 laptop, but running ATi.

Also, unrelated, but that's a heck of a fast mobile i3!

I still don't quite understand what it means when saying "emulator." I presume you have installed every piece of the CUDA toolkit and all the drivers correctly...so my guess at this juncture is BOINC having its own little issues with recognizing hardware and subsequently getting work for it.
____________

Therefore:
The Querying for a CUDA Device is so different in the OPTIMUS Technology,
see http://developer.download.nvidia.com/compute/cuda/3_2_prod/toolkit/docs/CUDA_Developer_Guide_for_Optimus_Platforms.pdf
page 3

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I think it would be better the app choose the GPU, than jiggle with profiles.
my two cents.

heinz

____________