Perhaps irrelevant, not knowing which dell laptop:

http://www.tomsguide.com/answers/id-1880807/dell-inspiron-15r-5537-graphics-driver-problem.html

http://www.tomshardware.com/answers/id-2218653/dell-inspiron-15r-5537-amd-8850m-switchable-graphics-enduro-sleep-hibernate-fix.html

- Brian