Re: suspend to RAM on lifebook 7110

Rafael J. Wysocki
2006-12-18T15:55:40Z

Hi,

On Monday, 18 December 2006 13:16, Pavel Machek wrote:
> 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.

Agreed.

Plus if we do it in the user space, we'll be able to drop it as soon as it's
no longer needed. ;-)

Greetings,
Rafael

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