RE: Inpiron 15R 5537 - Bad game performance or unability to Sleep/Hibernate?
I also have the same issue with the same laptop.
With the dell graphics, switchable graphics seem not to work correctly, as for example gpu-z will show only activity of the intel hd gpu when executing a 3D application, even if this application is assigned to "high performance".
And yes, the AMD driver 13.12 fixes this, but ruins the standby / sleep mode.
Dell, please hurry up with a fixed driver.