Ok, more fun... I have an Ehome IR receiver (media center) that under the 3878 BIOS does not work after resume from S3. Under 4752 it prevents the machine from going to sleep (powercfg tool in Windows 7), which actually is kind of good since WOL is totally broken. Is the proper channel to report these issues?
Sorry for my late response.
Yes, I can also confirm to have problems with the sleep state (S3) of my DP55WG system with BIOS 4752. This system runs under Windows 7 64 bit.
I can put my system in S3 state manually, but automatically it never goes into S3 state. I have set the system to switch off the display after 5 minutes, and to go into S3 state after 10 minutes. The display is switched off, but the system is not going into sleep mode.
However, I can not confirm this to be a problem with an USB device, because there are currently no USB devices connected to this machine, apart from the keyboard and mouse. For testing, I even disconnected the keyboard and mouse, and also the network cable, and still the system is not automatically going into S3 state.
So in my case it looks like some other cause then an USB device is preventing S3 state, but I have no idea what this could be.
It has been working correctly a while ago, and this could be before the latest BIOS update, so it might be that the BIOS update to version 4752 has caused this, but I am not sure.