sound regression in 3.2-rc3 (lenovo laptops)

[Chris Mason <chris.mason@oracle.com>]

Hi everyone,

I installed rc6 today on my laptop and discovered sound
no longer works.  I can hear a few clicks from the speakers as it boots,
but nothing else.

After a while I got the internal speaker in the laptop working by
randomly clicking between all the permutations of (mute, speaker,
headphone, main, speaker, beep, alsa, pulseaudio) in my mixer app.  But,
I couldn't get any noise out of the headphone jack.

I took a wild guess based on the changesets to snd-hda-intel and
narrowed it down to the change below.  With this reverted, I don't have
an alsa headphone output anymore (just master, pcm) and everything is
working again.

My laptop is an x201, not a T510...

-chris

commit 29c5fbbcfefba5225a6783683c46c39e10877703
Author: David Henningsson <david.henningsson@canonical.com>
Date:   Mon Jan 23 16:39:55 2012 +0100

    ALSA: HDA: Use model=auto for Thinkpad T510
    
    The user reports that model=auto works fine for him. Using
    model=auto bring in new features such as jack detection notification
    to userspace.
    
    Alsa info is available at http://paste.ubuntu.com/805351/
    
    Signed-off-by: David Henningsson <david.henningsson@canonical.com>
    Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index 8a32a69..a7a5733 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -3027,7 +3027,7 @@ static const struct snd_pci_quirk cxt5066_cfg_tbl[] = {
 	SND_PCI_QUIRK(0x17aa, 0x20f2, "Lenovo T400s", CXT5066_THINKPAD),
 	SND_PCI_QUIRK(0x17aa, 0x21c5, "Thinkpad Edge 13", CXT5066_THINKPAD),
 	SND_PCI_QUIRK(0x17aa, 0x21c6, "Thinkpad Edge 13", CXT5066_ASUS),
- 	SND_PCI_QUIRK(0x17aa, 0x215e, "Lenovo Thinkpad", CXT5066_THINKPAD),
+	SND_PCI_QUIRK(0x17aa, 0x215e, "Lenovo T510", CXT5066_AUTO),
 	SND_PCI_QUIRK(0x17aa, 0x21cf, "Lenovo T520 & W520", CXT5066_AUTO),
 	SND_PCI_QUIRK(0x17aa, 0x21da, "Lenovo X220", CXT5066_THINKPAD),
 	SND_PCI_QUIRK(0x17aa, 0x21db, "Lenovo X220-tablet", CXT5066_THINKPAD),