Semi-working patch for amd64 suspend/resume

[Jung-uk Kim]

On Wednesday 22 October 2008 05:28 pm, Nate Lawson wrote:
> Alexander Motin wrote:
> > Jung-uk Kim wrote:
> >> When you do 'sysctl debug.acpi.suspend_bounce=1' and 'acpiconf
> >> -s 3', does it bounce back?  If it does not, there are other
> >> problems, e.g., device drivers.  On my desktop, for example,
> >> vga(4) tries to restore previous state while resuming but it
> >> hangs system.  In fact, I believe ISA-era EGA/VGA save/restore
> >> routines do not work for modern graphics cards at all. :-(
> >
> > Test passed from both console and XOrg. I have integrated i965GM
> > video.
> >
> > Here is verbose messages from that trip "there and back again":
> >
> > Oct 23 00:11:55 mavbook acpi: suspend at 20081023 00:11:55
> >
> > Oct 23 00:12:00 mavbook kernel: vga0: saving 68 bytes of video
> > state Oct 23 00:12:00 mavbook kernel: pci0:0:2:0: Transition from
> > D0 to D3 Oct 23 00:12:00 mavbook kernel: pci0:0:2:1: Transition
> > from D0 to D3 Oct 23 00:12:00 mavbook kernel: pci0:0:26:7:
> > Transition from D0 to D3 Oct 23 00:12:00 mavbook kernel: acpi:
> > bad write to port 0x080 (32), val 0xbb
> > Oct 23 00:12:06 mavbook kernel: pci0:0:27:0: Transition from D0
> > to D3 Oct 23 00:12:06 mavbook kernel: pci0:0:31:2: Transition
> > from D0 to D3
> >
> > Oct 23 00:12:06 mavbook kernel: pci0:0:2:0: Transition from D3 to
> > D0 Oct 23 00:12:06 mavbook kernel: pci0:0:2:1: Transition from D3
> > to D0 Oct 23 00:12:06 mavbook kernel: acpi: bad write to port
> > 0x080 (32), val 0xaa
> > Oct 23 00:12:06 mavbook kernel: pci0:0:26:7: Transition from D3
> > to D0 Oct 23 00:12:06 mavbook kernel: pci0:0:27:0: Transition
> > from D3 to D0 Oct 23 00:12:06 mavbook kernel: pci0:0:31:2:
> > Transition from D3 to D0
>
> That's kind of weird.  The above devices were turned off (D3) then
> back on again (D0).  I'm wondering about that blocked write also.

The port 0x80 is usually used for BIOS debugging.

http://www.coreboot.org/FAQ#POST_card

Probably BIOS developer forgot to comment out the lines. :-)

Jung-uk Kim