2.6.23-rc4-mm1 - git-alsa.patch breaks audio on Dell Latitude D820

[Valdis.Kletnieks@vt.edu]

On Fri, 31 Aug 2007 21:58:22 PDT, Andrew Morton said: 
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.23-rc4/2.6.23-rc4-mm1/

git-alsa.patch breaks audio on my laptop, worked fine in -rc3-mm1.  Almost
certainly bustification in the Intel HDA rewrite.

Symptoms:  alsamixer finds the chipset, can adjust the volumes and mute/unmute,
and /usr/bin/play is able to write a .wav to the ALSA device without complaint.
However, no sound actually comes out.  Very "lights are on but nobody is home".

Dell Latitude D820, lspci reports:

00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
and alsamixer reports finding a "SigmaTel STAC9200"

% grep HDA_ .config
CONFIG_SND_HDA_INTEL=y
# CONFIG_SND_HDA_HWDEP is not set
CONFIG_SND_HDA_CODEC_REALTEK=y
CONFIG_SND_HDA_CODEC_ANALOG=y
CONFIG_SND_HDA_CODEC_SIGMATEL=y
# CONFIG_SND_HDA_CODEC_VIA is not set
# CONFIG_SND_HDA_CODEC_ATIHDMI is not set
# CONFIG_SND_HDA_CODEC_CONEXANT is not set
# CONFIG_SND_HDA_CODEC_CMEDIA is not set
# CONFIG_SND_HDA_CODEC_SI3054 is not set
CONFIG_SND_HDA_GENERIC=y
# CONFIG_SND_HDA_POWER_SAVE is not set

dmesg under -rc4-mm1:
Advanced Linux Sound Architecture Driver Version 1.0.14 (Fri Jul 20 09:12:58 2007 UTC).
ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 21 (level, low) -> IRQ 21
hda_intel: position_fix set to 1 for device 1028:01cc
ALSA device list:
  #0: HDA Intel at 0xefffc000 irq 506

dmesg under -rc3-mm1:

Advanced Linux Sound Architecture Driver Version 1.0.14 (Fri Jul 20 09:12:58 2007 UTC).
ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 21 (level, low) -> IRQ 21
hda_intel: position_fix set to 1 for device 1028:01cc
ALSA device list:
  #0: HDA Intel at 0xefffc000 irq 506

(Yes, they look the same to me, too...)

I'd provide more info, if I had a clue what else to add...

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