Re: Dell D600: teaching radeonfb how to wake up...

[Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>]

Hi!

> > > > > In the meantime, if we can (not sure about it) call back into the BIOS
> > > > > when waking up (Andi seemed to imply we are in real mode when getting
> > > > > out of sleep), we may just use int10 to hard re-POST video cards at this
> > > > > point. We must also make sure we do that for the AGP bridge if
> > > > > possible.
> > > > 
> > > > Look at arch/i386/kernel/acpi/wakeup.S code. It attempts to do
> > > > real-mode reinitialization (if you pass right acpi_sleep= paramater),
> > > > but it only works for some people.
> > > > 
> > > > If it is possible to improve that real-mode code to work more people,
> > > > feel free to send patches.
> > > > 
> > > > [I now have another machine -- arima notebook -- where none of current
> > > > methods works. I'll need to look at it closely.]
> > > 
> > > Well, I did a quick look only, I'm a bit dumb with x86 assembly, but
> > > it looks you are only trying to call VESA for setting a mode, not
> > > doing a full POST of the card
> > 
> > Yes, that's what I'm optionaly doing, but I'm also (optionally) doing:
> > 
> >         testl   $1, video_flags - wakeup_code
> >         jz      1f
> >         lcall   $0xc000,$3
> >         movw    %cs, %ax
> >         movw    %ax, %ds                                        # Bios
> > might have played with that
> >         movw    %ax, %ss
> > 1:
> > 
> > ...that should be POST(?)
> > 								Pavel
> 
> >From Ralph Brown interrupt list:
> 
> --------V--/YfH7FhGJxf49RI1O+iZ8Pj1EjU76Jnw+PUSNTvomfDsgDyMMLuEDg@public.gmane.org
> CALL C000h:0003h - VIDEO BIOS INITIALIZATION
> InstallCheck:	C000h:0000h must contain the word AA55h and the 
> 		  512*BYTE[C000h:0002h] bytes must sum to 00h (mod 256)
> Note:	is normally called only by the System ROM BIOS initialization code
> 
> In fact, this is a general method to POST any card if you know the
> location of the ROM in the EISA space.

That's what I'm doing, but it crashes machine on most
machines. Perhaps PCI needs to be already initialized at this point or
something like that?
								Pavel

-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]


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