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

[Pallipadi, Venkatesh]

>-----Original Message-----
>From: linux-kernel-owner@xxxxxxxxxxxxxxx 
>[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of Pavel Machek
>Sent: Thursday, October 21, 2004 4:23 PM
>To: Pallipadi, Venkatesh
>Cc: Kendall Bennett; linux-kernel@xxxxxxxxxxxxxxx; 
>linux-fbdev-devel@xxxxxxxxxxxxxxxxxxxxx; stefandoesinger@xxxxxx
>Subject: Re: [Linux-fbdev-devel] Re: Generic VESA framebuffer 
>driver and Video card BOOT?
>
>Hi!
>
>> >> 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
>> >> it at different times during resume. The current real 
>mode videopost
>> >> 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.
>> Both systems had Radeom 9000M cards, but one with older 
>version of the 
>> 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
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