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Console font setup problem in Sarge

I have installed some console only Debian systems. Woody and Potato worked well with kernel vga=6 video mode setup. Also some systems updated from Woody to Sarge works similar way without problems. A fresh Sarge installation start correcly but then it switch to different video mode and my problem is to find out how to disable this switch over.

When this mode change happens during the start up, I can see this text on console and kernel log file:

Oct 19 21:18:26 localhost kernel: vga16fb: initializing
Oct 19 21:18:26 localhost kernel: vga16fb: mapped to 0xc00a0000
Oct 19 21:18:26 localhost kernel: fb0: VGA16 VGA frame buffer device
Oct 19 21:18:26 localhost kernel: Console: switching to colour frame buffer device 80x30

I have tried many Googled instructions containing kernel parameters like video= and tried to blacklist this module from hotplug files without any visual change. Woody to Sarge update does not try to load this module and fonts are working. It is impossible to unload this module because it is in use.

Sarge setup program seems to have special startup parameter to disable framebuffer during setup. Maybe I need something similar. Of course I can compile new kernel without this framebuffer module but I would like to keep it simple and easy to update.

Does anybody know some method how to remove framebuffer modules or some another way to switch to text only console mode during start up?

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