Ubuntu Audio, YES! Windows XP, NO.
I run a dual-boot Ubuntu64and windows XP system. The windows partition really exists for a single purpose , and I occasionally just reboot the machine, choose the XP partition from the Grub menu, and all is well.
However, a few weeks ago, I upgraded Ubuntu, but when I rebooted the machine and chose the XP partition, I noticed the soundstopped working. What!? The audio worked fine in ubuntu!
The Secret: I had to completely power down the machine before booting into Windows. Then, audio works just fine.
Unfortunately, I didn't discover this until I'd re-installed the windows drivers (which didn't work), reformatted/reinstalled windows and all drivers (which only worked because I powered down in the process), fixed my grub boot loader , and incorrectly assumed the problem was fixed until I booted back into Ubuntu and back into Windows only to find that the problem remained.
Sheesh. So, if this has happened to you, I'm sure you've found the myriad article on how to get sound working in linux... which for me, has always worked just fine. Output of uname -a
:Linux homeserver 2.6.31-16-generic #53-Ubuntu SMP Tue Dec 8 04:02:15 UTC 2009 x86_64 GNU/Linux  A Soundblaster Audigy LS. Output of lspci
02:02.0 Multimedia audio controller: Creative Labs CA0106 Soundblaster
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