François Patte wrote:
I plug an external PS2 keyboard and an external PS2 mouse to a USB
port
of my laptop via a PS2/USB adaptator (CHESEN PS2 to USB Converter) and
sometimes I have some problems: led of keyboard flashes and during that
time, I cannot use the keyboard.
A frozen machine and flashing keyboard LEDs could indicate you've had a
kernel panic. In this case there may not be anything logged to disk.
Have you tried switching to a virtual terminal (Alt+Control+F2) before
plugging in your keyboard - you may see a stack trace from the kernel
panic on screen.