Re: Still problems with ACPI sleep state

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

Hi!

> > > > It tries to reinitialise the video bios after resume. This sometimes
> > > > helps get some amount of video functionality back. The actual sleep and
> > > > resume process is identical other than that.
> > >
> > > I see.  I didn't know if it was something else.  This is just the lcall
> > > hack.  We do that too:
> > >
> > >         /* Re-initialize video BIOS if the reset_video tunable is set. */
> > >         cmp     _0,reset_video
> > >         je      wakeup_16_gdt
> > >         lcall   _0xc000,_3
> > >
> >
> > Who is "we"? Do you have any other usefull hacks?
> > (we have second one trying to change the video mode)
> 
> We == FreeBSD.  I don't think your int 10h video hack helps so we don't
> use it.  Do you know of a system that it helps?

Toshiba 4030cdt notebook. Its VGA is in default text mode... which is
bad if you are trying to use vesafb. int 10 fixes it.

> As far as getting suspend/resume to work, I'm very suspicious
> of the disable bus mastering call in AcpiEnterSleepState.  It's known to
> cause laptops (IBM T40) not to enter S5.  That's why it's currently only
> enabled for sleep states other than S5.  I suspect it may affect S4 and
> possible S3 also.
> 
> Could you give me a quick summary of how linux sets up its drivers for
> suspend/resume?  I've found a Dell where Linux S3 works but FreeBSD's does
> not.  Even with all the drivers removed, it "bounces" back to life instead
> of going to sleep in FreeBSD.  It doesn't crash though.  For

Do you enable proper GPEs? I'm not ACPI wizard but I heard something
like that.

> suspend/resume, we save/restore the PCI BARs for the drivers and then let
> the drivers save their own private state.  Is there anything else you know
> of that would cause this "bounce"?  It happens even with no drivers
> installed except for ATA and all removable hw removed.

We do PCI BARs too (but started doing that only recently), plus many
drivers have specific things they do...
								Pavel
-- 
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