Thanks so much for this tip!
My two-week old One worked perfectly out of the box, but started having standby/hibernate troubles a few days ago. It would go into standby properly, but when I tried to wake it up, no matter what keys I pressed, the monitor would stay black, although the power light turned green and it otherwise seemed to be functioning. It would take a power-down-and-reboot to wake up the monitor. Meanwhile, hibernation would hang at the "preparing to hibernate" screen; again, it required holding in the power button to shut down and a complete reboot to revive it.
I set the pc not to standby or hibernate, but I wasn't very happy with that solution.
We tried uninstalling software we had added, thinking that was causing the problem, but to no avail. Then I found this thread. My One came with the Acer Crystal Eye Webcam 1.0.1.3 (SuYin) driver installed. When we uninstalled it, standby worked fine. We couldn't find version 1.0.1.5 anywhere, but the USB Video Device driver was in the list of options presented by the device manager, as described above, so we installed that.
Now standby, hibernate and webcam all seem to be working fine, even after reinstalling the other software.
Is there any reason I should be looking for any other webcam driver? The webcam isn't a priority, but I'm curious as to whether there are performance differences between drivers.
I'm also relieved that this fixed the trouble and we don't have to try updating the BIOS. I have 3305. If everything is working OK, is there any strong benefit to replacing it with 3309 or whatever version will be out next month or the month after?
Anyway, thanks for the working solution and the other great advice on this site. So far, I am loving my One, even after the panic when we accidentally turned the touchpad off and didn't realize that was what happened. (Fn+F7 toggles the touchpad.)