I did. It worked yesterday according to Michael Gerdau, but apparently it doesn't today.
Well, that's what I wondered.
Michael, could you check the default pincfg entries in /proc/asound/card0/codec#* whether they really match with the values in patch_sigmatel.c?
Ok, took me some more time (didn't want to test while almost asleep...)
/proc/asound/card0/codec#* _do_ reflect the pincfg entries as of patch_sigmatel.c
I also once again have my sound working with both Dell-XPS.patch (the one I originally tested) as well as the later version Dell.patch. I also have a working LFE control with both patches.
I have not yet a clear understanding why I did not have sound and LFE yesterday. However the thing that's different is that yesterday morning I booted into a kernel with the patched alsa and did no other alsa mod unload/load until I reverted the patch (when I got back my sound).
When doing my initial test as well as todays test I booted into the pristine hg20070818 (or hg20070817 back then) driver and loaded the patched modules via '/etc/init.d/alsasound restart'.
I can't reboot the machine until about 16:00 today to check whether booting into the patched driver does make a difference or not but I will do so this afternoon and report my results (of course this could be a red hering).
FYI I've attached /proc/asound/card0/codec#* to this mail in case that is of interest.
Best, Michael