My laptop is an HP 6735s, with an AMD Turion RM-70 CPU, 2 GB of RAM, and running Vista Home Premium 32-bit, SP2. It has a Marvell Yukon 88E8042 network adapter - I've installed the latest drivers from Marvell (dated 1/28/2012).
Ever since I ran a Windows Update about 2 months ago, the network adapter is not active after the machine wakes from sleep/hibernate. By this I mean the adapter is not on the list of devices in Device Manager, nor on the list of "Local Area Networks" in "Network Connections" in "Control Panel."
The adapter works normally if I run a Restart - but this pretty much renders sleep/hibernate functionality useless. Does anyone have any ideas re: how to fix this? Or at least how to "activate" the network adapter after sleep/hibernate without having to restart the machine?

Hey you slackers! I found one fix for this issue myself. In "Device Manager", under the "View" menu, I clicked "View hidden devices." Then, when "Network adapters" becomes visible, under the "Action" menu, I clicked "Scan for hardware changes."
The network adapter seems to work normally after doing this. If anyone can explain how I can avoid this situation in the first place, I'd still appreciate it! But if anyone else is suffering from the same problem - here's one way to deal with it.

Thanks for the reply. I generally use a wired connection, so the wireless button is usually turned off. I did try turning wireless on/off several times. But this didn't seem to have any affect on the network adapter.
I tried to find the power settings you suggested, but couldn't find anything to seemed to apply. Could you perhaps be a bit more specific?
Also, in response to the new regime of having to get into Device Manager every time I want to wake the PC, I put a link to Device Manager on my desktop (it's not quite so annoying this way). Is there some way to automate this process into the normal wake procedure, and "force" the PC to scan for the network adapter itself each time it wakes?

Thanks for your reply. Yes, my system was set to "Allow computer to turn off this device to save power." I disabled this feature, and re-booted the PC. At first, this seemed to have fixed the problem. But not always. Sometimes I still have to go through the "device manager/show hidden devices/scan for hardware changes" routine. I've been observing the behavior for a few days to try to see a pattern of when the system "wakes up" with the network adapter working and when it's not. I can't see any patterns.
I agree with you that this shouldn't be happening, but it is. Do you have any other ideas re: how I might fix this? Thanks!