Update - Dell has indicated that they no longer support Modern Standby being disabled.
I still have a ticket open with GoTo/LMI, and I'm hoping that they can at least give me a workaround. These computers will wake up if they receive the WoL magic packet (or pattern match), so I really just need LMI to send that packet. I have to assume that this will become a widespread issue as computer manufacturers (apparently) deprecate support for anything that isn't Modern Standby.
For anyone finding this thread later, here is the link to Dell's whitepaper describing that Modern Standby cannot be disabled and legacy S3 functionality cannot be restored. (link)
The most recent response from GoTo Support is that Modern Standby is not supported, and they have no plans of ever supporting it. However, I am trying to get GoTo Support to understand that this would mean that LogMeIn's wake on LAN functionality would then not be compatible with any Dell computer going forward (~50 million computers per year). I have not specifically researched, but I imagine that the other major computer manufacturers will be heading the Modern Standby route as well, since it is really Microsoft pushing it. So really my only options would be A) LogMeIn develops support for Modern Standby, or B) I have no choice but to start working toward using a different remote access software.
