First post here.. I'm having an odd issue with cgminer 3.7.2. I've got it set up with what seems to be stable parameters for my 2x Sapphire Dual X 7950's, but if I let it run for several hours and then go to restart it (to switch pools or whatever), it locks up the display drivers bad enough to require a reboot. If I leave it alone, it runs fine for hours.
I'm on Win 7 with a 1100w power supply and Catalyst 13.9. Right now, I've got one card turned way down since I have an airflow problem, but here's the batch file I'm using:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt -w 256,256 -I 17,11 -g 1 --gpu-engine 950-1080,950-1080 --gpu-memclock
1500,1500 --temp-target 69,72 --temp-overheat 75,78 --auto-gpu -o [pool] -O [worker login]
pause
Getting about 620kh/s on gpu 0, which I think is pretty good for I=17. Temps are 68-70C.
Anyone have any ideas what could cause this?
Edit: This thread provides a solution / workaround:
https://bitcointalk.org/index.php?topic=187160.0