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Is it possible to issue a VBE3.0 call from Grub (1.95) to set desired re

From: Dimitry Golubovsky
Subject: Is it possible to issue a VBE3.0 call from Grub (1.95) to set desired refresh rate?
Date: Tue, 29 May 2007 10:03:35 -0400


I am using Linux 2.6 on x86-64 with framebuffer console, VIA Unichrome
integrated graphics chip on a VIA K9MM-V motherboard.

When the videomode is set using Linux kernel boot options
(video=vesafb vga=...), default refresh rate is 60Hz which causes
visible blinking on a CRT monitor. The vesafb-tng driver does not work
in 64 bit kernels. Kernel framebuffer driver modules specific to VIA
Unichrome were tried, but none worked.

Is setting a videomode via VBE3.0 call 4f02h with desired refresh rate
possible from within Grub - using the grub.cfg file, or with some

Another thing, how to pass parameters to Linux kernel so that it does
not attempt to change the video mode when loading the vesafb
framebuffer driver?

Video mode needs to be set just once, during the boot process.


PS I am completely new to Grub, but familiar with low-level programming.

Dimitry Golubovsky

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