Windows 8 ran perfectly on this old HP notebook, but Windows 8.1 is unable to wake from sleep or hibernation. I simply get a black screen.
Several discussion groups are pointing to drivers. Users have fixed hibernation problems by updating device drivers.
The HP support site stops issuing drivers for this model at Windows 7, so I can't rely on HP.
My ATI graphics card already had the latest. My Intel NIC is up-to-date as well. I downloaded newer packages from both companies, but the underlying drivers haven't changed. I took what I could get from Windows Update for the audio driver.
I can shutdown the laptop after every use, but that takes a great deal of time by today's standards. I may have to reinstal Windows 8 and decline the 8.1 update.
I'm assuming that sleep is easier to achieve than a full hibernation. If can't have both, then I'll take just one.