Re: Re: Samsung P35 and S3 suspend

["Stefan Dösinger" <stefandoesinger-RbZlAiThDcE@public.gmane.org>]

> It turns out that this works badly. A large number of machines have code
> at c000:0003 that jumps to somewhere else in the video ROM - this
> executes a small amount of code (normally turning off the screen) and
> then jumps elsewhere. In laptop hardware, this second jump is often to
> code that is no longer mapped into address space. I've seen several
> machines where trying to run POST code under XFree's x86 emulator fails
> because it suddenly hits a pile of binary that looks nothing like the
> x86 instruction set.
This is partially true for my system. The instruction at c000:0003 is a JMP. 
But the code seems to remain in the area around 0xc0000. A jump somewhere 
else is a good explanation for the crashes on some machines.

Is this code used by the system bios to boot the VGA card when powering on the 
machine?

> POSTing will help in some cases (it seems to work well on Thinkpads),
> but it's not a universal cure. I've had more joy with saving and
> restoring the VBE state.
Is this the vbestate utility? I'll have a look at it. What does 
vm86_video_post do? It looks like another lrmi based "call c000:0003 
utility". Can only saving and restoring the VBE state bring the card back to 
live or do I need to call the reset routine in any case?

Stefan


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