I completely removed IntelRST (deinstalled from Program Options, removed all Intel devices from device manager including option 'remove files from computer'), restarted and reinstalled drivers from windows update. Problem persists!
Afterwards I installed Windows 7 from scratch onto my secondary HDD. All drivers downloaded from Windows Update, no downloads/install from HP or from Intel. The same problem as Windows 8: computer can not wake from sleep if ATA password set for Intel 520. Removing password protection from 520 solves the problem. Note: the magnetical secondary (now system) drive is still password protected.
Any suggestions are welcome... Is there any firmware update which would solve it? I can't understand, why the drive doesn't ask for the password on resume from sleep.
Thanks