Monitor complains on my grub resolution..

[German]

Whenever I boot in the system, while in grub, messages pops up on my
monitor that I operate in 800x600 while preferred resolution is
1920x1080. After I got login prompt or in the system itself I god
1920x1080. But do I do with monitor message when it is in grub? Can
grub go to 1920x1080 resolution and if so how do I go about it? Very
annoying. Thanks