RE: [Linux-fbdev-devel] Re: Generic VESA framebuffer driver and Video card BOOT?

-----Original Message-----
From: linux-kernel-owner@vger.kernel.org 
[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Pavel Machek
Sent: Thursday, October 21, 2004 4:23 PM
To: Pallipadi, Venkatesh
Cc: Kendall Bennett; linux-kernel@vger.kernel.org; 
linux-fbdev-devel@lists.sourceforge.net; stefandoesinger@gmx.at
Subject: Re: [Linux-fbdev-devel] Re: Generic VESA framebuffer 
driver and Video card BOOT?

Hi!

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I have done some experiments with this video post stuff.
I think this should be done using x86 emulator rather than doing 
in real mode. The reason being, with an userlevel emulator 

we can call

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it at different times during resume. The current real 

mode videopost

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does 

Actually Ole Rohne has patch that allows you to call real mode any
time you want.

Yes. I tried Ole's patch. That helped on one of my laptops. But, on 
the other one it doesn't work. It goes into real mode but 

never returns.

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Both systems had Radeom 9000M cards, but one with older 

version of the 

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firmware (didn't work) and one with newer version.

IIRC, even Stefan had similar problems with Ole's patch.

It did not work for me, either, but I verified that it works as
expected if I comment out actuall call of BIOS. So the problem is not
with Ole's patch but with bios, and it may be the same if you emulate
it...

[Of course, it will not crash whole system when emulated, but system
without video is not too good, either].

Even I thought so. But, with the emulator it doesn't hang. It brings 
back my video. I double checked this using another vm86 emulator too. 
No hang even there. I couldn't figure out why Ole's patch won't work 
though. Right now I am using call_usermodehelper() to call the 
emulator during resume and the video comes back just fine on this 
system where Ole's patch didn't work.

Thanks,
Venki