Bug#659519: [3.1 -> 3.2.4 regression] Sound problems (Re: Other card works the same way!)
David Baron wrote:
> On Tuesday 15 May 2012 00:44:08 Jonathan Nieder wrote:
>> David Baron wrote:
>>> [ 7.366048] nvidia: module license 'NVIDIA' taints kernel.
[...]
>> Probably blacklisting the nvidia driver through /etc/modprobe.d would
>> prevent these messages about the same. But I don't think it's the
>> cause of the problem.
>
> These messages happen because Nouveau grabs the interfac unless IT is
> blacklisted or nomodeset
Sorry for the lack of clarity. I meant messages indicating that the
nvidia binary-only driver has been loaded, like the one I've left
unsnipped above. (There are others, but that's the clearest one.)
[...]
>> Was the machine especially active, or is there a cooling problem?
>
> These happen a lot, seem not to be dependent on room temperature. The CPU fan
> works, I have de-dusted it, the case is open and still.
>
> There is a "temp1 at 55 c listed on PCI adapter. It seems rock steady, too
> steady! I can get it to 59-60 on a heavy 3d hw-accelerated graphics game.
> Maybe this sensor is on the nvidia pci-express card, not the cpu!
Ah, that makes sense. The overheating might be due to the GPU.
[1] has a rough overview of the current state of nouveau power
management --- NV40 looks like it has ok support, and your card
advertises only one performance level, but probably there is still
something that could be done.
[...]
>> If 3.1.y (e.g., from snapshot.debian.org) still works fine, the above
>> look like red herrings, so still no idea what's actually wrong. Would
>> you be able to bisect to find the change that introduced this
>> regression (I can list what commands do so)?
>
> Since problem occurs with or without nvidia, that is not the problem.
> If non-sound drivers are causing this problem, I would guess virtual box
> because it needs alsa for sound in its VMs. Further testing needed.
Right. We should probably take this upstream soon, so if you get a
chance to try with the virtualbox and nvidia drivers blacklisted, that
would be useful.
Thanks again for the quick feedback.
Sincerely,
Jonathan
[1] http://nouveau.freedesktop.org/wiki/PowerManagement
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