Monitor Information Detection

For display information detection, it must support VBE (BIOS-level extension of VESA ). When the monitor supports this extension, it is called through the BIOS in the system real mode.

Int 10 h to obtain detailed information about the monitor.

You may need to call the following BIOS sub-functions:

Ah = 0x4f00

Obtain BIOS-level extensions for the VESA of the monitor

Ah = 0x4f01

Obtain a specific Display Mode Supported by the monitor

Ah = 0x4f02

Set the current video mode

Ah = 0x4f03

Obtain the current video mode

Ah = 0x4f04

Save/restore svga Display Mode

Ah = 0x4f15

Obtain the monitor's edid Extension Information

You can find some compilations in the kernel source code.CodeFor example, under ARCH/i386/boot/video. S:
# Get video mem size
Leaw modelist + 1024, % di
Movw $0x4f00, % ax
Int $0x10
Xorl % eax, % eax
Movw 18 (% di), % ax
Movl % eax, % FS :( param_lfb_size)

You can view the VBE documentation.
You can also use the C language.
You can also view the Code related to frambuffer.