Issue after resume w Powerplay enabled - game crash

I have a single 5870 in my m17x. After sleep/resume I noticed in gpu-z that my gpu clock stayed at 300/400 instead of clocking up to max at 700/1000 when running games. That was with Dell's own graphics drivers. I then installed AMD's reference drivers (11.3) in the hope that that would fix the issue, but lo and behold. Now when I start a game after sleep/resume, it just crashes. If I disable Powerplay, the clocks just stay at 300/400 come what may, which of course gives low framerates. If I put the laptop to sleep with Powerplay disabled and after resume re-enable Powerplay, then games work fine and the clock throttles properly up to the max of 700/1000 and down to 100/150 at no load.

In conclusion, thus, it appears that Powerplay is unable to properly and safely sleep/resume a 5870. Something bad happens in the resume. If Powerplay is enabled outside the sleep/resume cycle, everything works well.

I've read about various sleep/resume problems with m17x but I've not found "my" problem reported anywhere, although I assume I'm not alone?

Anyone tried the same and more importantly know of a fix for this?

EDIT: I have now observed graphics working properly after a sleep/resume, with Powerplay enabled. So it now appears to be a typical troubleshooting dilemma with unpredictable behaviour and no clear pattern. I would nevertheless still like to know if anybody else has experienced this. Oh, and I also have the "plugged in, not charging" likewise with no apparent pattern - I wonder if there is some kind of general power issue related to states going on in the m17x-r2?