I have a big problem. Sometimes (not always), when I power on my laptop, my USB devices (mouse, keyboard and other) don't work. All devices work, indicators are on, but it doesn't work in Ubuntu.
And sometimes, when I don't use my laptop, usb devices don't work too. I came to my laptop, try to do anything, but I have not results and I have to reboot my laptop.
What can I do? Before this, when I'd used only windows 7, I didn't have this problem.