Question Low resolution boot/uefi/bios

May 3, 2019
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I have an ASRock h270 Pro4 motherboard, Asus ROG STRIX 1070 GPU, and an msi Optic MAG 1080p 144hz 24 inch monitor. On boot, bios/uefi, the resolution is 1024x768 (the resolution of my old monitor) I can't seem to change it so that the resolution is fhd 1920x1080. Does anyone know how I can change this?
 
Try disabling CSM (Compatibility support module) in the BIOS.

If that doesn't work, you can try doing a hard reset of the BIOS. If you changed monitors since the last time the BIOS was updated or reset, that could be part or all of the problem. Usually, it's not, but it has been known to happen with the UEFI not showing full HD resolutions. Also, in some cases, if a board comes with a limited BIOS ROM size and you update the BIOS at some point late in it's life, it's possible that the manufacturer may have had a need to include instructions and microcode that are large enough to require reducing support for HD display, such as with the recent MSI motherboards that were updated for Zen2 support.