Asus Z97-A BIOS/UEFI 2205 poor display quality

[2fast]

Hi,
i'm new to the forum.

I updated the BIOS/UEFI of my Z97-A from version 1205 to 2205 ,
and now i've got poor video quality when enter to the BIOS/UEFI .
I use integrated GPU (HD4600) and monitor NEC EA231WMi
with DisplayPort connection.

The quality is poor and some value are written with very small font,
so it's very hard to read and modify parameter and settings.

Tnank you in advance.
Luke

[2fast]

It seems that the resolution is 640x480 and when it upscale to 1920x1080
the quality is poor.

A screnshot taken from BIOS/UEFI (original size converted to jpeg),
note the font size of actual value (very very small and unreadable).

Any suggestions ?

Thank you,
Luke