Re: Dell Latitude 5490 -- Ceases functioning when attempting
I have tested a Dell workaround that disables the S5 and S6 power management in the registry, and it appears to work. A bit quirky in that it seems to "re-find" a device when it returns from the Sleep state and gives the Windows "Reconnect" sound.
Per Dell, the workaround will be incorporated into an Intel graphics driver some time in August.
With that said, there seems to be some progress being made.
For now I would set Power Management to "Never" turn off the display, and hold out for the updated graphics driver.