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Re: [herbert@gondor.apana.org.au: Re: Bug#161931: kernel-image-2.4.19-k7: VESA driver for console]



#include <hallo.h>
* Raul Miller [Wed, Oct 23 2002, 05:59:42PM]:
> > 	That would be a good start.
> 
> Ok.  Next question: who poses the questions?  [I'll do it if no one
> else does: sometime tomorrow.  If you prefer your own style of asking

Wait, I found the answer from Gerd from our last conversation! See
attachment.

As stated, nothing will break if vesafb is just available in the kernel.
If a user enables it, sHe should know whether the video card supports it
(most do). In contrary, when the user switches from existing,
vesafb-enabled configuration to a Xu's kernel, he only gets a 
_black screen_. No warnings, no hints.

Gruss/Regards,
Eduard.
-- 
Failure is not an option. It comes bundled with your Microsoft product.
From kraxel@debian.org Wed Jan 09 18:43:40 2002
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Date: Wed, 9 Jan 2002 17:29:08 +0100
From: Gerd Knorr <kraxel@debian.org>
To: Eduard Bloch <blade@debian.org>
Subject: Re: VESA fb in Debian - please give a hint
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> Please answer to these question and allow to Cc' your answer to the BTS:
> 
>  - is the VESA framebuffer dangerous in any way if it is builtin in the
>    all-people kernel?

No.  It's not used by default, just saying 'Y' to vesafb doesn't
activate it at boot time.  fbcon+vesafb comes into play if you pass a
vesa graphics mode as vga=xx argument to the kernel.

>  - is there is a simple way to make it modularize the driver? 

No.  vesafb depends on the VGA BIOS activating the graphics mode (which
is done in real mode startup code).  Thus it works on nearly all
graphics cards on earth, but it also has a few drawbacks:  Limited to
flickering 60Hz standard vesa modes, no mode switching at runtime, it's
very slow, ...

>    If no, is a replacement in development? 

No.  Some people tried to play tricks (use vm86 to call the BIOS) to
overcome the limitation mentioned above, but that isn't trivial.

  Gerd

-- 
#define	ENOCLUE 125 /* userland programmer induced race condition */



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