[Bug 192868] multiple issues with nVidia MCP51 HDA sound card on Gigabyte GA-K8N51GMF-9 mainboard

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https://bugzilla.redhat.com/show_bug.cgi?id=192868


Dominik 'Rathann' Mierzejewski <rpm at greysector.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|nVidia MCP51 HDA sound      |multiple issues with nVidia
                   |card: quiet sound, no       |MCP51 HDA sound card on
                   |master channel, no PCM      |Gigabyte GA-K8N51GMF-9
                   |channel and no ability to   |mainboard
                   |switch to non-8ch mode      |
    External Bug ID|                            |ALSA Project 2145




--- Comment #19 from Dominik 'Rathann' Mierzejewski <rpm at greysector.net>  2008-09-13 15:35:30 EDT ---
Upgraded to F-9, these issues are still present:
* PCM channel being inoperative unless >2 speakers are connected
* low volume
* no ability to switch to 2ch mode
* there's no "Boost Mic signal" option (hence recording is rendered useless)

One more issue, and this one is a real joy-killer. It seems that somehow, a
high-pass filter gets activated by default and the basses are cut off. I only
noticed that after buying a subwoofer for my stereo set.

However, if I set the model to auto, i.e.
modprobe snd-hda-intel model=auto
I get another on/off switch in the mixer, called "Headphone", which seems to
switch between a low-pass and high-pass filtering. I.e., I can get either
higher or lower frequencies cut-off, but I can't disable the cut-off at all.

Moreover, I was playing with using other model settings, and it appears that
the asus* models set the card properly in this regard, and I get both high and
low frequencies without any filtering. Sadly, it works only in 2ch mode. Any
speakers connected to higher ports (back, LFE+Center or side) remain silent.

I tried different models and I seem to get good bass and treble with
model=asus-dig, but then I don't get more than 2 output channels.

$ rpm -q kernel alsa-lib
kernel-2.6.26.3-29.fc9.x86_64
alsa-lib-1.0.17-2.fc9.x86_64

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