My question is about the linux kernel. It may be related to some issues regarding the video cards, that's why I mention them.
I have Ubuntu 14.04, with linux kernel 3.13.0-37, on a Dell Vostro 3550 with 2 video cards (intel -integrated in the CPU- and AMD Radeon)
Today I had an issue with the suspended state: the mouse and keyboard were not functioning after that, so I had to press the button to turn it off and restart. After trying various things (the last one was to upgrade the nvidia driver, which was probably a mistake - my previous Dell Laptop had a nvidia video card, this one has AMD radeon), I ended up not being able to boot at all.
I booted with the previous kernel version 3.13.0-36 and all my issues were gone! For now, I simply deleted the 3.13.0-37 kernel, but I wonder if this is a good idea on the long term. Should I try to reinstall the 3.13.0-37 kernel?
Can I find out what went wrong in the first place? I was not even online when the suspended state problem first arised, so it cannot be a recent upgrade. About the nvidia driver instead of radeon - this is clearly my mistake. Should I delete the nvidia driver? And should I install a radeon driver? How do I find out which video card is in use and how can I manage the 2 graphic cards?
Maybe I need to ask another question about the video cards, for now I would just like to know what to do about the linux kernel.