My experiments so far with the 9360 suggest the following: 1. Disabling the EC will kill control with the F11/F12 keys. This can be restored in session using ClickmonitorDDC, which I like better anyway -- much more granular control. 2. If you install Clickmon, you will maintain control through modern sleep sessions IF ON AC POWER. But when I pull the plug, there's a consistent loss of control when the XPS wakes thereafter. 3. If you just kill modern sleep and treat hibernation as the new S3 sleep, you will maintain control of brightness. Of course, when I wake up from that, the print reader pretty consistently doesn't work. There's always one more glitch . . . I should be able to fall back a couple of BIOS versions to the last one where Dell had a force S3 sleep option. I don't know if that would work better, because I've not had time to test it yet. I'd rather S3 than modern sleep anyway for my use case, so I'll likely try it at some point. Interested to compare notes to see if this is consistent across XPS machines and generations. . . .