Grub boot menu keys has suddenly changed, can't use arrow keys

Asked by Gabor Vas on 2013-09-25

I'm using Kubuntu 12.04, grub 1.99 on an Acer Aspire 5750 laptop, with a multiboot system. Suddenly, I realized I can't select boot option with arrow keys but I can use "p" for previous, "n" for next, and "e" for last option. Extarnal usb keyboard gives the same exact result. I updated grub and checked all computer for malwares, still negative result, no effects at all.
If i boot kubuntu, any kernel version, my keyboard functions properly later on, I can type password in, I can change keyboard layout with ALt+Caps, etc. But if I boot win7, I can't type my password in, not even with on-screen or external keyboard. However, pressing backspace fills with certain (hidden) characters the password field.
I assume a loaded kubuntu kernel uses different drivers for keyboards, but why grub and win7 fails to use theirs?

Question information

English Edit question
Ubuntu grub2 Edit question
No assignee Edit question
Solved by:
Thomas Krüger
Last query:
Last reply:
Best Thomas Krüger (thkrueger) said : #1

The key combinations for Grub are Ctrl+N and Ctrl+P, not N and P. Is it possible your Ctrl key it stuck?

Gabor Vas (cognac-gamma) said : #2

Well, it is possible as my left control had not worked for ages. The problem has appeared much later. But with my right Control I can handle all key combinations in kubuntu.
If the case is stucked left Control, is there any temporary solution until I have my keyboard repaired? Or how can I ensure that's the case?

Try setting the USB to legacy mode in BIOS

Gabor Vas (cognac-gamma) said : #4

Thanks Thomas Krüger, that solved my question.

Gabor Vas (cognac-gamma) said : #5

Thanks all, it seems to be imposiible mission to get to advanced BIOS