Sometime between -mmotm1017 and -rc2-mm1, something odd happened to the sound subsystem. On my Dell Latitude D820, audio works OK if it's sitting there standalone, or in its docking station.
However, when I plug in headphones, it goes silent.
Sorry for not having any more detail, but I've not had a chance to bisect this down to a specific commit.
I did run alsa-info for the two kernels, here's a diff between them. I also attached a copy of the full output for working -mmotm1017.
(- lines are working -mmotm-1017, + are busted -rc2-mm1)
--- alsa-info-mmotm1017 2008-11-10 14:17:04.000000000 -0500 +++ alsa-info-rc3-mm1 2008-11-10 14:13:17.000000000 -0500 @@ -3,7 +3,7 @@ !!ALSA Information Script v 0.4.51 !!################################
-!!Script ran on: Mon Nov 10 14:16:47 EST 2008 +!!Script ran on: Mon Nov 10 14:12:28 EST 2008
!!Linux Distribution @@ -15,7 +15,7 @@ !!Kernel Information !!------------------
-Kernel release: 2.6.27-mmotm1017 +Kernel release: 2.6.28-rc3-mm1 Operating System: GNU/Linux Architecture: x86_64 Processor: x86_64 @@ -25,7 +25,7 @@ !!ALSA Version !!------------
-Driver version: 1.0.18rc3 +Driver version: 1.0.18 Library version: 1.0.18rc3 Utilities version: 1.0.18rc3
@@ -39,7 +39,7 @@ !!-----------------------------
0 [Intel ]: HDA-Intel - HDA Intel - HDA Intel at 0xefffc000 irq 314 + HDA Intel at 0xefffc000 irq 41
!!PCI Soundcards installed in the system @@ -165,8 +165,8 @@ Pin Default 0x0321121f: [Jack] HP Out at Ext Left Conn = 1/8, Color = Black DefAssociation = 0x1, Sequence = 0xf - Pin-ctls: 0xc0: OUT HP - Unsolicited: tag=30, enabled=1 + Pin-ctls: 0x00: + Unsolicited: tag=3d, enabled=1 Connection: 1 0x0b Node 0x0e [Pin Complex] wcaps 0x400181: Stereo @@ -234,12 +234,12 @@ !!ALSA Device nodes !!-----------------
Looks like it lost the bits that setup the headphone jack.