[Nouveau] [Bug 75985] [NVC1] HDMI audio device only visible after rescan

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 28 12:33:51 UTC 2017


Maik Freudenberg <hhfeuer at gmx.de> changed:

           What    |Removed                     |Added
                 CC|                            |hhfeuer at gmx.de

--- Comment #13 from Maik Freudenberg <hhfeuer at gmx.de> ---
(In reply to Peter Wu from comment #12)
> On my laptop that area is somewhere after the AER
> capability and is all zeroes, it does not seem to make sense.

Why do you mention AER capability in this context? Are associated registers
normally the highest used in PCI config space? Could you give a hint on that?
Seen from a hardware perspective, this could make sense. Since the audio is
another PCI function not always needed, it sure has some enable pin on the chip
so it can be toggled or disabled by some external circuitry, vendor specific.
And some (reserved) gpio pin is used to make it switchable through software. So
maybe the config space >=0x400 being gpio space?
Wild guess, of course.
Interesting would be if after write, this can be read or returns zero again? 
What about desktop cards, do they also have this register? Is this always set

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