edid & bochs

[CodePoet2005]

Hi fellow devs,

Im writing a bootloader from scratch and im now getting the edid info to pick the best video mode.
In qemu i can specify a preferred resolution using the following command line option:

Code: Select all

-device VGA,edid=on,xres=1920,yres=1080

My bootloader successfully picks this mode.

In bochs however i haven't found an similar option. The edid does exists (can get it from the bios) but it contains a non existent resolution: 1920 x 1200. No vbe mode matches this.


Also is it even worth it selecting the preferred resolution?
Any decent monitor and graphics card supports ancient resolutions.

Does anyone have any ideas why the bochs edid contains a false preferred mode (or how i can change it)?

Cheers,
CodePoet2005

[gmoney]

In your bochsrc do you see a line that looks like this? ( vga: extension=vbe, edid=on )

[CodePoet2005]

Hi,

In your bochsrc do you see a line that looks like this? ( vga: extension=vbe, edid=on )

Thank you so much, adding

Code: Select all

vga: extension=vbe

fixed the strange edid. The edid now contains a nice 1920x1080 preferred resolution.

Cheers,
CodePoet2005

[gmoney]

No problem, and don't have too much fun coding