The system specification
GRUB boot loader
OS: Windows 7 / Kubuntu 12.04 LTS
Keyboard: Roccat Isku
Motherboard: MSI Z77 MPower with the latest BIOS
SSD/HDD: Kingston HyperX 3K (AHCI in BIOS enabled), 2 other HDDs
I will provide more specific configuration if needed.
As stated in the topic I cannot navigate in the GRUB menu using mentioned keyboard (there is no problem when I use Logitech K360). I have tried both USB 2.0 and USB 3.0 ports.
I cannot enter BIOS menu as well, however if I enter it using other keyboard, Roccat seems to work and I can navigate in the BIOS menu without any issues.
Any ideas how can I fix that problem?