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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [NVC1] HDMI audio device only visible after rescan"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75985#c77">Comment # 77</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [NVC1] HDMI audio device only visible after rescan"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75985">bug 75985</a>
from <span class="vcard"><a class="email" href="mailto:dan@reactivated.net" title="Daniel Drake <dan@reactivated.net>"> <span class="fn">Daniel Drake</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=144596" name="attach_144596" title="Acer Predator G3-572 acpidump">attachment 144596</a> <a href="attachment.cgi?id=144596&action=edit" title="Acer Predator G3-572 acpidump">[details]</a></span>
Acer Predator G3-572 acpidump
Martin Lopatář, thanks for the analysis above, sorry I missed those details
before!
Checking on my Acer Predator G3-572 (acpidump attached here), I can see what
you're referring to in SSDT5:
OperationRegion (PCNV, SystemMemory, \_SB.PCI0.PEG0.PEGP.EBAS, 0x1000)
Field (PCNV, AnyAcc, NoLock, Preserve)
{
Offset (0x488),
, 25,
MLTF, 1
}
Method (_PS0, 0, NotSerialized) // _PS0: Power State 0
{
If (DGOS)
{
If ((\_SB.PCI0.PEG0.PEGP.DPCS != Zero))
{
\_SB.PCI0.PEG0.PEGP._ON ()
DGOS = Zero
}
}
ElseIf ((\_SB.PCI0.PEG0.DVID != 0xFFFF))
{
If ((GGIV (0x01080001) == Zero))
{
MLTF = Zero
}
Else
{
MLTF = One
\_SB.PCI0.PEG0.PEGP.NASV = \_SB.PCI0.PEG0.PEGP.DSSV
}
}
}
MLTF presumably means multifunction and it's exactly the bit we've been working
with. But I haven't yet managed to get _PS0 to run this code. I get to the
GGIV(0x01080001) call, but it returns 0, so the bit doesn't get set.
I looked for some obvious connection to stuff in _DSM but I can't spot
anything. Can you clarify exactly what you saw that links _DSM and _PS0
together, and share your acpidump?
I tried understanding what GGIV() does but nothing is clear there. It ends up
reading bit 1 from physical memory address 0xfdac0408 which is under:
pci_bus 0000:00: resource 21 [mem 0xfd000000-0xfe7fffff window]
and I can't immediately spot any ACPI code that writes to that address.</pre>
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