I posted this to the LKML, I thought it should be reproduced on this list.
> > On Sunday, 17 June 2007 03:36, Matt Mullins wrote:
> > > I just received a Dell Latitude D630, with the new Intel Santa Rosa
> > > platform. Currently, the only major driver issue I have is sound. It
> > > worked fine in Ubuntu Feisty's 2.6.20 kernel, but now I am using Gutsy
> > > so I can have graphics drivers. Gutsy's 2.6.22-rc3-based kernel no
> > > longer recognized my soundcard, a Sigmatel STAC9205, which uses the
> > > hda_intel driver. I have since fixed that problem by compiling the
> > > hda_intel driver into the kernel (I used 2.6.22-rc4 vanilla sources),
> > > instead of a module, but it is still a bug that it does not work as a
> > > module.
> > >
> > > All the following debug information was obtained from kernel 2.6.22-rc4.
> > >
> > > However, the bug that is currently affecting me is that sound no
> > > longer works after using ACPI suspend-to-RAM or swsusp. I compiled
> > > ALSA debugging in, and as soon as I resume, I get tons of messages
> > > like:
> > > [ 8.474830] hda-intel: send_cmd timeout: IRS=0x1, val=0xd0970500
> > > [ 8.474954] hda-intel: send_cmd timeout: IRS=0x1, val=0xd0af0009
> > > [ 8.475078] hda-intel: send_cmd timeout: IRS=0x1, val=0xd0a70500
> > > [ 8.475207] hda-intel: send_cmd timeout: IRS=0x1, val=0xd0bf0009
> > > (etc)
> > >
> > > There may be more before that, but that is more than the kernel
> > > message buffer can hold, so I can't ever see it. I get similar
> > > timeout messages each time a PCM gets set up:
> > > [ 8.972859] hda_codec_setup_stream: NID=0x10, stream=0x5, channel=0, format=0
> > > x11
> > > [ 8.972987] hda-intel: send_cmd timeout: IRS=0x1, val=0x1070650
> > > [ 9.006071] hda-intel: send_cmd timeout: IRS=0x1, val=0x1020011
> > > [ 9.006081] hda_codec_setup_stream: NID=0x11, stream=0x5, channel=0, format=0
> > > x11
> > > [ 9.006207] hda-intel: send_cmd timeout: IRS=0x1, val=0x1170650
> > > [ 9.016117] hda-intel: send_cmd timeout: IRS=0x1, val=0x1120011
> > >
> > > I read some of sound/pci/hda/hda_intel.c, specifically the code that
> > > output those messages. After octupling my kernel log buffer (to 1MB),
> > > I noticed that for the first set of timeouts (immediately upon
> > > resume), all the "codec" nibbles are odd, the last word of the val
> > > ("verb" and "para") are all either 0x0500 or 0x0009. For the second
> > > set (when something tries to use the card) that last word is 0x0650 or
> > > 0x0011.
> > >
> > > I have yet to go back and re-test compiling snd-hda-intel as a module.
On 6/17/07, Matt Mullins <mokomull@xxxxxxxxx> wrote:
> I've been reading up on the Intel HD Audio specifications, and I found
> that the problem is most likely that the driver has to resort to PI/O
> (single_cmd) mode. I really haven't had enough time or experience to
> figure out what is actually causing this. This is the first time I've
> done any kernel development; thankfully, Intel has good documentation.
> I'm going to keep hacking to see what information I can figure out.
>
> I just tried 2.6.22-rc5, and no behavior has changed.
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