I can't find a solution how to fix sleep on HP Probook 4540s with Mac Os X ML 10.8.3. i5-2450m sandy-bridge, intel hd3000. I used probook installer 6.1b7, and then 6.1b11(big thanks for blink screen fix, my screen went brighter). So when i go to sleep, system just freezes, black or grey screen...