(In reply to comment #35)
> Hi Ilia,
> 
> > 8e9e3d2deacc460fbb8a4691140318f6e85e6891 + 
> > hdmi-1.patch + hdminva3.patch + hdminva3-3.patch
> 
> Not good news:  Good 'eld#3.0',  No HDMI sound

OK. That means there's something else still that I'm missing :(

> 
> I'd like you to take a little time to review my procedure, correct it if
> necessary, and thus keep us in sync.
> 
> cd /root/linux                                  # Linus directory
> make mrproper
> git checkout 8e9e3d2deacc460fbb8a4691140318f6e85e6891
> # At this point, files to be patched are each copied ('cp -p') to
> <name>-orig.
> cd /root/Temp                                   # Patch directory
> cp -p ../linux/drivers/gpu/drm/nouveau/core/engine/disp/hdanva3.c-orig
> hdanva3.c
> cp -p ../linux/drivers/gpu/drm/nouveau/core/engine/disp/hdminva3.c-orig
> hdminva3.c
> cp -p ../linux/drivers/gpu/drm/nouveau/core/engine/disp/hdminv84.c-orig
> hdminv84.c
> #
> patch -Np8 -i hdmi-1.patch ; echo $?
> patch -Np8 -i hdminva3.patch ; echo $?
> patch -Np8 -i hdminva3-3.patch ; echo $?
> cp -p {hdanva3,hdminva3,hdminv84}.c                  
> /root/linux/drivers/gpu/drm/nouveau/core/engine/disp/

That does seem like it would work, but definitely not the way that I'd do it.
I'd do more like

cd linux
git checkout 8e9e3d2deacc460fbb8a4691140318f6e85e6891
git checkout drivers/gpu/drm/nouveau (this should remove any local changes you
have in that dir on tracked files)
patch -p1 < hdmi-1.patch
patch -p1 < hdminva3.patch
patch -p1 < hdminva3-3.patch

> # Build, reboot, test:
> cat /proc/asound/card1/eld#3.0                  # Good, Bad?
> aplay -D plughw:1,9 test.wav                    # HDMI sound?
> 
> -- Alex