[alsa-devel] 2.6.31.x vs. rme vs. alsa 1.0.22?
nando at ccrma.Stanford.EDU
Tue Feb 23 01:20:49 CET 2010
On Tue, 2010-02-23 at 00:16 +0000, Fernando Lopez-Lezcano wrote:
> On Mon, 2010-02-22 at 23:51 +0000, Fernando Lopez-Lezcano wrote:
> > On Tue, 2010-02-16 at 17:58 -0800, Fernando Lopez-Lezcano wrote:
> > > Hey, has anyone been seeing strange behavior from this combination?
> > >
> > > kernel 2.6.31.x rt20 + alsa 1.0.22 userland
> > > RME card (pcmcia card + multiface)
> > >
> > > hdspmixer is not doing the right thing (does not initialize the card in
> > > a way in which playback works), it does not see the hwdep interface (or
> > > something like that) and disables metering,
> > I have been trying to see if I can figure _anything_ out of this...
> > A diff of 2.6.29 (last known working) against 18.104.22.168 reveals
> > something that might have an influence on the problem:
> > in snd_hdsp_create_hwdep there are two lines added:
> > + hw->ops.open = snd_hdsp_hwdep_dummy_op;
> Hmmm, looks like snd_hdsp_hwdep_dummy_op is not passing back the
> hdsp->hwdep structure to the open call at all (returning 0 is not enough
> from the description of the alsa api). That would explain what is
> happening, most probably no ioctls are found...
> Am I on the right track?
Argh. I was looking at the diff backwards (DOH!). The ops.open and
ops.release ioctl calls are _missing_ in the 22.214.171.124 tree.
> > hw->ops.ioctl = snd_hdsp_hwdep_ioctl;
> > + hw->ops.release = snd_hdsp_hwdep_dummy_op;
> > And snd_hdsp_hwdep_dummy_op just returns 0...
> > Other differences between the two files (not that many) seem irrelevant
> > to me.
> > I imagine this is what is causing the difference in behavior (hwdep
> > fails). Any suggestions on what I could try to fix this?
> > Thanks for any help!
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