Core clock and memclock are stable, only the hasrate drops
Bug happened on all pools
Bug happened with all configurations (even with no overclock)
Bug happened with catalyst 1.13 and 1.12 on linux bamt (other have the same bug on w7)

What is your version?
I'll try to male a log file.


I'm pretty confident there is a bug somewhere.
Question is: what can possibly make the hasrate to drop if the engine and memclock did not change?
If we have a list, may be we can track down the various possibility, but we have no list. I was thinking that only the engone and memory clock can make the hasrate moving (may be intensity too).

Is it possible that the intensity switch, and How can I track that?
Is there some other things that can modify the hasrate besides engine, memclock, intensity?
[/quote]
what about temperatures, rejected shares?
Do you have any background processes in your comp - liek AV program which stats checking hdd after 10min inactivity... or screensaver

Try downloading Process Hacker and see if there is process consuming GPU except sgminer