The same (or similar) issue here! After upgrading from linux-image-3.13.1 to 3.14.1, the screen on my laptop (a Dell Latitude D630) turn screen to black all time I remove the AC cord from energy plug and all the time I plug de AC cord to energy plug. If I leave the laptop until it change the screen to black, to save energy, the fn+birghtness not function any more: screen turn black and I need to boot the system. Booting to the kernel image 3.13-1, using grub, resolves that issue. However, all time I not remember to change this at the grub and the system go a head using 3.14.1.
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