Another couple:

1) So what does more exactly longpoll do and how to enable it with cgminer? I was under impression that it should be enabled by default, unless I specify --no-longpoll, but somehow it doesn't work for me on Slush pool. Shall I add LP to the pool URL?

2) So what's the best kernel for Radeon 5xxx ATM, shall I add -k phatk for optimum performance?

P.S. I really want to kill AMD, upgraded to latest Debian testing and the 10.7 or 10.8 or whatever they are consume 100% CPU. Argh...