Re: suspend to RAM on lifebook 7110

[Pavel Machek <pavel@ucw.cz>]

Hi!

> thanks for explaining this, i am obviously not too deep into that
> PCI bus stuff :-)
> 
...
> > > I thought that this should somehow go away by the PCI bus suspend/resume
> > > methods that somewhen back got merged by Greg K-H.
> > 
> > The kernel will only save and restore the standardised PCI configuration 
> > registers - anything else needs to be handled by the specific device 
> > driver. Unfortunately, in the graphics hardware case, the closest thing 
> > to that is the framebuffer driver. Which we don't tend to use.
> 
> So the question is: should we either
>  - implement a minimal "graphics card PCI suspend resume" "driver" in the
>    kernel that will do this even if no framebuffer is used, or

We are going there, but it is *hard* to do, due to kernel graphics
missdesign. Could take years.

>  - implement this as a workaround in userspace?
> 
> I mean - it is not rocket science to do it in s2ram, but it just seems
> more correct (to me) to do it in the kernel, where the correct locking
> and ordering is more or less guaranteed.

Lets do it in userspace. Doing in kernel is right, but it will be
hard.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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