On Sat, 2016-02-27 at 23:47 +0100, Cristian Ionescu-Idbohrn wrote:
> On Sat, 27 Feb 2016, Linus Torvalds wrote:
> > On Sat, Feb 27, 2016 at 1:52 PM, Cristian Ionescu-Idbohrn
> > <cristian.ionescu-idbohrn@axis.com> wrote:
> > > Background: https://bugs.debian.org/815787
> > >
> > > "Until recently the Sound Blaster Live! card in my workstation worked
> > > fine. Sometime recently it has stopped working."
> > >
> > > On Sat, 27 Feb 2016, Ben Hutchings wrote:
> > > > On Sat, 2016-02-27 at 10:39 +0100, Cristian Ionescu-Idbohrn wrote:
> > > > >
> > > > > No mention of that in the changelog.
> > > >
> > > > Yes there is:
> > > >
> > > > * [amd64] mm,nvdimm: Disable ZONE_DMA; enable ZONE_DEVICE, NVDIMM_PFN
> > > > - This disables drivers for some AC'97 sound cards
> > >
> > > Alright, but not obvious to me.
> > >
> > > So, what is to do about that?
> >
> > If I read this right, this seems to be a Debian kernel configuration
> > choice rather than anything else.
That's exactly what it is. In unstable, which is called that for a
reason.
> > Does it work if you just compile your own kernel?
>
> Wooh. That was fast ;) I'll try to beat Ben to it ;) Tomorrow...
> Too late now.
>
> Still, I really wonder what the debian changelog motivation behind it
> might be. Various applications work much nicer with 4.3.5-1, than
> ever. I read in the kernel log:
>
> commit 5c408fee254633a5be69505bc86c6b034f871ab4
> Author: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
> Date: Mon Jan 18 20:07:44 2016 +0100
> ...
> This fixes hard lockup on fsl_ssi module reload,
> at least in AC'97 mode.
> ...
> commit 3f1c241f0f5f90046258e6b8d4aeb6463ffdc08e
> Author: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
> Date: Sun Dec 20 21:30:25 2015 +0100
> ...
> This unbreaks AC'97 register access.
> ...
> commit 25e5ef974c33f1e4a07a68bf830e6493ee6dab11
> Author: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
> Date: Sun Dec 20 21:34:29 2015 +0100
> ...
> ASoC: fsl-asoc-card: use different route map for AC'97 mode
>
> fsl_ssi uses different stream names ("AC97 Playback" / "AC97 Capture")
> in AC'97 mode so in this case fsl-asoc-card route map should
> also be using them.
>
> But, I can't see that _does explain_ the:
>
> * [amd64] mm,nvdimm: Disable ZONE_DMA; enable ZONE_DEVICE, NVDIMM_PFN
> - This disables drivers for some AC'97 sound cards
>
> nor justifies the action. Ben, care to explain?
The features that I enabled conflict with ZONE_DMA which is required by
these sound drivers.
If that conflict is removed then I'll happily enable them again.
Ben.
--
Ben Hutchings
Every program is either trivial or else contains at least one bugAttachment:
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